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OO gauge
UK prototype model of a 00 scale (1:76) British Rail Class 25 locomotive shown with an 18 millimetres (0.7 inches) diameter five pence coin
Scale4 mm to 1 ft
Scale ratio1:76.2
Model gauge16.5 mm (0.65 in)
Prototype gaugeStandard gauge

The terms OO gauge and OO scale (or more correctly but less commonly, 00 gauge and 00 scale) relate to the most popular standard gauge model railway standard in the United Kingdom,[1] outside of which it is virtually unknown. "00" is a variant of "H0", meaning Half-0, which historically derives (in increasing size order) from 0 scale, 1 scale and 2 scale, the most popular scales in the early 20th century. Since railway modellers invariably pronounce the zero as "oh" rather than "zero" (e.g. "double-oh" or "aitch-oh"), the scales are often written as OO, HO and O.

00 scale is one of several 4 mm-scale standards (4 mm to the foot or 1:76.2), and the only one to be marketed by major manufacturers of British-outline models.

Logically, to replicate the full-size ("prototype") standard gauge of 1435 mm (4 ft 8+1⁄2 in) the track gauge at 4 mm-to-the-foot scale would be 18.83 millimetres (0.741 inches). However, the gauge is 16.5 mm (0.65 in), which is the same as in H0 scale – 3.5 mm to the foot or 1:87. This oddity has historical origins: essentially, 00 scale involves 4 mm-to-the-foot bodies being mounted on 3.5 mm-to-the-foot track. The result is that 00 rolling stock appears to be running on narrow gauge. The anomaly led some 4 scale modellers in the 1960s to adopt a gauge of 18.2 mm (EM scale), soon followed by some who decided to adopt 18.83 mm and wheel/track proportions very close to full-scale practice (Protofour standards).[2][3]

Origin

[edit]
"Scale" and "gauge"

Scale is the ratio or proportion of the model to the prototype. Gauge is the distance between the rails. The terms are not interchangeable.

Double-0 scale model railways were launched by Bing in 1921 as "The Table Railway", running on 16.5 mm (0.65 in) track and scaled at 4 mm to the foot. In 1922, the first models of British prototypes appeared. Initially all locomotives were powered by clockwork, but the first electric power appeared in 1923.

Hornby Railways Flying Scotsman locomotive on an OO gauge layout

"00" describes models with a scale of 4 mm = 1 foot (1:76) running on HO scale 1:87 (3.5 mm = 1 foot) track (16.5 mm/0.650 in).[4] This combination came about since early clockwork mechanisms and electric motors were difficult to fit within H0 scale models of British trains, which have a smaller loading gauge than their European and North American counterparts and locomotives with smaller, often tapered, boilers. A solution was to enlarge the scale of the model to 4 mm to the foot but keep the 3.5 mm to the foot gauge track. This also allowed more space to model the external valve gear. The resulting HO track gauge of 16.5 mm represents 4 feet 1.5 inches at 4 mm to the foot scale, which is 7 inches too narrow or approximately 2.33 mm too narrow in the model.

In 1932, the Bing company collapsed, but the Table Railway continued to be manufactured by the new Trix company. Trix decided to use the new HO standard, being half of French 0 gauge (1:43.5 scale). However, European 0 scale is 1:45.

In 1938, the Meccano Company launched a new range of 00 models under the trade name of Hornby Dublo. The combination of 4 mm scale and 16.5 mm gauge has remained the UK's most popular scale and gauge ever since.

In the United States, Lionel Corporation introduced a range of 00 models in 1938. Soon other companies followed but it did not prove popular and remained on the market only until 1942, when Lionel train production was shut down due to wartime restrictions to the use of steel. 00 was quickly eclipsed by the better-proportioned H0 scale. The Lionel range of 00 used 19 mm (3⁄4 inch) track gauge, equating to 57 inches or 4 ft 9 in – very close to the 4 ft 81⁄2 in of standard gauge. The following of American 00 scale declined and today it is negligible.[citation needed]

00 today

[edit]

00 remains the most popular scale for railway modelling in Great Britain due to a ready availability of ready-to-run rolling stock and starter sets. Ready-to-run in the UK is dominated by Hornby Railways and Bachmann Branchline.[5][6] Other sources of ready-to-run rolling stock or locomotives include Dapol, Heljan, Peco, Rapido Trains UK, Accurascale, and previously Lima, ViTrains,Tri-ang Railways, and Mainline Railways. Other scales, with the possible exception of N , lack the variety and affordability of UK ready-to-run products.[citation needed]

Scaling and accuracy

[edit]
The difference half a millimetre makes: 00 scale (left) and H0 scale (right) models of the EMD Class 66 locomotive
00 scale, like H0, permits an accessible level of detail, including weathering and individual numbering.

16.5 mm (0.65 in) gauge at 4 mm-to-the-foot means that the scale gauge represents 4 ft 1+1⁄2 in (1257 mm), 7 inches (178 mm) narrower than the prototype 4 ft 8+1⁄2 in (1435 mm). This difference is particularly noticeable when looking along the track.

Some modellers use 00 track to represent the 5 ft 3 in (1600 mm) Irish gauge, where it is a scale 13+1⁄2 inches (343 mm) too narrow.

These differences have led to the development of the finescale standards of EM gauge and Protofour.

In common with most practical model railways of any scale (and not related to the 00 gauge inaccuracy) the following compromises are made:

  • Curves are usually much sharper than the prototype, and often not transitioned, particularly when using "set-track" systems (radius 1 = 371 mm, 2 = 438 mm, 3 = 505 mm, 4 = 571.5 mm).
  • Overhang from long vehicles necessitates the track centres being increased to prevent collisions on curves between rolling stock on adjacent lines.
  • Over-scale wheel width and flange depth are used on typical models (particularly older models), which require over-scale rail profiles and much larger clearances on pointwork than is prototypical. Pointwork is often compressed in length to save space.

4 mm fine-scale standards

[edit]

Many modellers after starting in 00 scale find its "narrow-gauge" appearance unsatisfactory. Greater accuracy is possible using EM or the closer-to-exact-scale P4 track. Products and information are supplied by the EM Gauge Society and Scalefour Society respectively.

See also

[edit]

Other model railway scales

[edit]
[edit]
  • OO9 – Used for modelling 2 ft (610 mm) narrow gauge railways in 4 mm scale, often paired with OO scale layouts.
  • 00n3 – Used for modelling 3 ft (914 mm) narrow gauge railways in 4 mm scale with 12 mm (0.472 in) gauge track.
  • H0 – 3.5 mm scale using the same 16.5 mm (0.65 in) gauge track as 00.
  • EM – 4 mm scale using 18.2 mm (0.717 in) track.
  • P4 – A set of 4 mm standards using 18.83 mm (0.741 in) gauge track (accurate scale standard gauge-track).
  • 00-SF – Uses 16.2 mm (0.638 in) track with ordinary 00 wheelsets. Allows the tighter trackwork tolerances of EM without the need to re-gauge wheels.

Manufacturers

[edit]
  • Accurascale – A relatively new manufacturer founded in 2015 producing UK and Irish locomotives and rolling stock.[7]
  • Airfix – Bought the Kitmaster range and sold it under the Airfix brand until the original Airfix company collapsed in 1981. Some of the tooling was then destroyed, but Dapol bought the remainder. Most Airfix military vehicles are also to 1:76 scale.
  • Bachmann Branchline – One of the largest manufacturers of ready-to-run 00.
  • Dapol – Produce kits (using the Kitmaster toolings bought from Airfix) and ready-to-run locomotives and rolling stock.
  • Hattons Model Railways – A former model railway retailer that also produced ready to run 00 models. The model toolings were sold to Rails of Sheffield and Accurascale when the company ceased trading in 2024.[8]
  • Heljan – A semi-major player in the business, less notable than other companies though.
  • Hornby – One of the largest manufacturers of ready-to-run 00. Originally known as 'Hornby Railways'.
  • Kitmaster – Manufactured plastic model kits of locomotives, rolling stock, and buildings.
  • Lima – Produced budget 00 ready-to-run, bought by Hornby.
  • Peco – Produce a wide range of track, kits, and other accessories.
  • Rapido Trains UK – A subsidiary brand of the Canadian Rapido Trains Inc. specialising in UK model trains.[9]
  • Sonic Models – A relatively new manufacturer that makes 00 and N scale models.[10]
  • Tri-ang Railways – A former manufacturer whose name was dropped when their parent company acquired the Hornby brand; made models of locomotives and rolling stock.
  • Planet Industrials – A new manufacturer in the business, known mostly for kits but has produced Ready to Run (RTR) versions of the Kerr, Stuart and Company 'Victory' class locomotive.[11]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

OO gauge

View on Grokipedia
from Grokipedia
OO gauge is a model railway scale and gauge system primarily used in the United Kingdom and Commonwealth countries, characterized by a scale ratio of 1:76.2 (equivalent to 4 mm to 1 foot for the models) and a fixed track gauge of 16.5 mm, which represents a slight compromise since the accurate gauge for this scale would be approximately 18.83 mm to match British standard gauge prototypes of 1,435 mm. This combination allows for detailed representations of British locomotives, rolling stock, and scenery on a relatively compact layout, making it accessible for hobbyists with limited space while maintaining visual fidelity to real railways. The origins of OO gauge trace back to the early , when it was introduced in by as the "Table Top Railway," designed by Henry Greenly as a smaller, more affordable alternative to O gauge amid post-World War I economic constraints and anti-German sentiments that favored British manufacturing. Its development unfolded in three main phases: an experimental period from to 1939, marked by early adoption and fine-scale innovations from groups like the Wimbledon Model Railway Club; wartime establishment from 1939 to 1945, during which production adapted to restrictions; and a surge in popularity from 1945 to 1975, driven by ready-to-run (RTR) models from manufacturers such as Hornby Dublo (launched in 1938) and Tri-ang (from the 1950s). Key pioneers like Trix (entering in 1935) and Bing contributed to standardization, solidifying OO as a distinct British standard despite international parallels with HO gauge, which shares the 16.5 mm track but uses a finer 1:87 scale. Today, OO gauge remains the dominant and most popular scale for model railways in the UK, accounting for the majority of commercial RTR products and enthusiast layouts due to its balance of detail, availability, and compatibility with digital command control (DCC) systems. Leading manufacturers like Hornby, Bachmann, and Dapol produce extensive ranges of British outline models, including steam, diesel, and electric locomotives from the Big Four era through to modern rail, supporting both beginner starter sets and advanced fine-scale modifications. Enthusiast groups, such as the Double-O Gauge Association, promote standards and events, while variants like EM gauge (18.2 mm track) and P4 (18.83 mm) offer options for greater prototypical accuracy among purists.

Fundamentals

Definition and Scale

OO gauge is a prominent standard in model railroading, characterized by a scale ratio of 1:76.2 or 4 mm to the foot and a track gauge of 16.5 mm (0.65 in), which is a compromise representing the prototype British standard gauge of 1,435 mm (4 ft 8+1⁄2 in) at approximately 1:87 scale. This combination allows for detailed replication of railway vehicles and infrastructure at a size suitable for tabletop and shelf layouts, balancing visual fidelity with practicality for indoor hobby use. The nomenclature "OO," often pronounced "double O," emerged to differentiate this scale from the larger O gauge, signifying a reduction in size while preserving certain design compatibilities in the early development of model trains. Although primarily associated with British outline models—such as those depicting locomotives and rolling stock from the UK's railway heritage—OO gauge is adaptable for representing prototypes from other regions, including European and American designs, through custom or specialized kits. In hobbyist modeling, OO gauge supports a wide array of applications, including the construction of locomotives, passenger and freight , and integrated scenery elements like stations and signals, fostering immersive dioramas and operational layouts.

Track Gauge and Compatibility

The standard track gauge for OO gauge model railways is 16.5 mm, a dimension established in the to represent British standard gauge prototypes at a scale of approximately 1:76.2. This gauge allows for reliable operation of while accommodating adaptations for narrow gauge modeling, such as , where 9 mm gauge track is used to depict prototype narrow gauges around 2 feet (600–700 mm), enabling modellers to integrate narrow gauge lines into standard OO layouts without altering the primary . Wheel and track standards in OO gauge are compatible with European NEM standards for H0 scale, though British fine-scale variants may differ. Commercial models typically feature a flange depth of 0.9–1.05 mm to ensure smooth navigation over rail contours and frogs. These dimensions promote among manufacturers, though fine-scale enthusiasts often opt for shallower flanges (around 0.7 mm) to better match prototype proportions while maintaining running stability on code 75 or code 100 rails. Track components, including points and crossings, are designed with flangeways of 1.25–1.5 mm to accommodate these , minimizing derailments on both straight and curved sections. OO gauge systems are compatible with analog 12 V DC control, where power is supplied directly to the rails via a controller, and (DCC), which uses NMRA-compliant decoders installed in locomotives for independent operation. Wiring norms for both include a main bus of 14–16 AWG wire for power distribution, with feeder drops of 22 AWG to track sections, ensuring drop across layouts up to 100 feet. DCC upgrades are straightforward, as most modern OO locomotives are DCC-ready, allowing dual-mode decoders to run on either system without rewiring. Common track types in OO gauge include sectional track, which consists of pre-formed straight and curved pieces that snap or clip together for quick assembly, and flexible track, which uses continuous rail sections that can be shaped to custom radii. Sectional track offers the advantage of ease for beginners and temporary setups but limits curve flexibility and realism due to fixed geometries, whereas flexible track enables smoother transitions and more prototypical layouts at the cost of requiring , pinning, and application. Proprietary systems like Hornby Setrack provide integrated roadbed for vibration-free operation but restrict customization, while generic options from or Atlas allow mixing with other brands for versatile baseboard installations on or cork underlay.

Historical Development

Origins in the Early 20th Century

OO gauge emerged in the early as a compact alternative to the larger O gauge model railways, which had dominated the hobby since the late but required significant space for layouts. The scale was developed to appeal to home-based enthusiasts, particularly in Britain, where post-World War I economic recovery fostered interest in affordable hobbies among the . Initial efforts focused on replicating British steam locomotives, reflecting the era's fascination with the expanding railway network and its cultural significance. Pioneering work began with a between British model railway specialist W.J. and the German manufacturer Gebrüder Bing, who introduced the world's first commercial OO gauge system in 1922 as the "Table Top Railway." This clockwork-powered line featured locomotives and , such as tank engines and passenger coaches, designed for tabletop setups measuring around 6 feet by 4 feet. To navigate lingering after the war, the models were marketed under the brand, debuting at model railway exhibitions that autumn and gaining publicity through trade journals. By 1925, Bing expanded the range to include electric models, addressing demands for more realistic operation while overcoming early motor-fitting issues in the smaller scale. Engineer Henry Greenly contributed significantly, defining OO as 4 mm to the foot (approximately 1:76 scale) with a 16 mm in his 1924 Model Railways, though production used a slightly wider 16.5 mm for compatibility and reliability. Early OO models faced challenges with inconsistent scaling, as the half-size track relative to O gauge's 32 did not perfectly align with precise proportions for British prototypes, leading to oversized wheels (up to 5 treads) for smooth running on rudimentary tracks. These compromises prioritized playability over accuracy, with some early experimenters favoring a 3.5 to the foot scale before the adoption of 4 to the foot. This evolution underscored OO's appeal to middle-class hobbyists seeking detailed yet accessible representations of the steam era amid interwar prosperity. The 16.5 established in these origins persists as the modern standard for OO layouts.

Standardization and Post-War Growth

Following , efforts to standardize OO gauge gained momentum through influential publications and organizations. The Model Railway Constructor magazine, which had advocated for consistent scales during the , played a pivotal role in debating and promoting uniform standards for 4mm modeling. The British Railway Modelling Standards Bureau (BRMSB) contributed significantly, having established wartime standards for OO (16.5 mm track) in 1942 and publishing post-war standards for OO and EM gauge in July 1951, which included the official adoption of 1:76.2 as the scale for OO gauge, paired with 16.5 mm track. The and 1960s saw significant growth in OO gauge popularity, propelled by manufacturers like Tri-ang and . Tri-ang introduced affordable plastic-molded ready-to-run (RTR) sets in the early , expanding to 21 RTR locomotives by , which democratized the hobby for beginners. complemented this with plastic kit models starting in 1960, including several rolling stock kits by 1963, making detailed assembly more accessible. Clubs such as the EM Gauge Society, formed in 1955 to advance finescale standards in 4mm modeling, further supported OO gauge by encouraging precise proportions and trackwork beyond commercial norms. The advent of injection-molded plastics during this era revolutionized production, enabling mass manufacturing of durable, detailed components that aligned with the newly standardized scale. OO gauge's expansion remained largely confined to countries, reflecting its British roots, while achieving dominance in the UK market by the 1960s, as indicated by the Railway Modeller's circulation reaching 56,000 copies by 1960.

Contemporary Usage

Adoption and Popularity Today

OO gauge maintains a dominant position in the UK model railway market, accounting for the majority of overall activity among enthusiasts. This popularity stems from its widespread availability of ready-to-run models and accessories, making it the preferred choice for both novice and experienced modellers in the 2020s. Adaptations for (DCC), introduced as a standard in the , have further enhanced its appeal by enabling sound effects, lighting, and precise control, with many older OO models retrofitted to support these features. The hobby thrives through robust community engagement, supported by organizations such as the Association of Model Railway Clubs (Wales and West of England) and over 590 local clubs nationwide that foster collaboration and skill-sharing. Online platforms like RMweb, with nearly 50,000 members and millions of posts, serve as vital hubs for discussions on OO gauge layouts, troubleshooting, and inspiration. Exhibitions, including those at the Southport Model Railway Village, draw thousands annually, showcasing intricate OO displays and promoting social interaction among participants. Beyond traditional layouts, OO gauge models find applications in dioramas for scenic storytelling and educational settings, such as projects illustrating historical . The demonstrates resilience against digital gaming alternatives, with 21% of practitioners citing reduced as a key benefit and 48% reporting stress relief and improved mental focus. Demographic trends show increasing adult participation driven by and therapeutic value, contributing to steady post-2010 sales growth for major producers like Hornby PLC, whose revenue rose 2% to £56.2 million in 2024, marking five consecutive years of expansion.

Key Manufacturers and Products

Hornby, established in 1920 and a pioneer in British model railways, has been a dominant force in OO gauge production since launching its Hornby Dublo line in 1938, offering ready-to-run (RTR) locomotives renowned for their historical accuracy and detail. The company produces flagship models such as the LNER Class A3 Flying Scotsman, with versions featuring advanced features like DCC sound and steam generator effects in recent releases. Hornby's locomotives span steam, diesel, and electric types, including iconic examples like the Class 37 diesel and HST sets, often incorporating proprietary mechanisms for smooth running. Bachmann Europe, formed in 1989 through the acquisition of Mainline and models, specializes in highly detailed rolling stock, including wagons and coaches that emphasize era-specific liveries and fine-scale proportions. Their product range includes comprehensive sets of BR-era freight wagons, such as the Clay series, and passenger coaches with interior detailing, contributing to the evolution of OO gauge realism since the late 1980s. Bachmann also offers locomotives like the Class 90 electric, integrating (DCC) compatibility for enhanced operation. Dapol, founded in 1983, focuses on affordable accessories and , producing items like kits and detailed vans that complement OO layouts without high costs. Their locomotives, such as the Class 22 diesel reintroduced in 2011, feature improved mechanisms and options for added realism in contemporary releases. , a UK-based specialist since , dominates OO gauge track production with products like the Streamline and Setrack systems, offering flexible electrofrog turnouts and code 100 rails for reliable electrical conductivity. These tracks support both starter layouts and complex permanent ways, often used alongside RTR models from other manufacturers. OO gauge products encompass locomotives in steam (e.g., Hornby's ), diesel (Bachmann's Class 47), and electric (Dapol's Class 73) variants; rolling stock including detailed coaches and wagons with NEM couplings; and control systems like Hornby's eLink DCC for digital operation. Recent innovations include factory-weathered finishes on models from all major producers, enhancing visual authenticity. The OO gauge market has seen consolidation, with Hornby acquiring the remaining stake in LCD Enterprises in 2021 (subsequently sold back to its founders in November 2024) to expand tooling capabilities and acquiring the Corgi Model Club in 2024 for subscription-based collectibles. Entry-level sets, such as Hornby's Flying Scotsman starter pack, typically retail for £100–£200, making the scale accessible to beginners while premium RTR locomotives exceed £150.

Technical Specifications

Scale Accuracy and Proportions

OO gauge employs a scale ratio of 1:76.2, equivalent to 4 mm representing 1 foot in prototype dimensions, ensuring that model features are proportionally reduced by this factor for visual fidelity to real-world counterparts. To achieve accurate conversions, prototype measurements in millimeters are divided by 76.2; for instance, a 20-meter (20,000 mm) prototype length translates to approximately 262 mm in OO scale (20,000 ÷ 76.2 ≈ 262). This ratio allows for detailed replication of British prototypes, but practical modeling introduces discrepancies to accommodate mechanical components and track compatibility. Common inaccuracies in OO gauge arise from the fixed 16.5 mm , which is narrower than the scale-accurate 18.83 mm required to represent the prototype's 1,435 mm standard gauge, necessitating adjustments in model proportions. In British steam locomotives, the compact of real prototypes—often limiting widths to under 9 feet—exacerbates these issues, leading to under-scaling of widths for sufficient track clearance and motor fitment while over-scaling elements like boilers to maintain visual prominence. For example, ready-to-run models of locomotives such as the LMS Black Five frequently exhibit slightly widened body shells or shortened underframes relative to exact 1:76.2 proportions to ensure reliable operation on commercial track. These proportional compromises impact overall realism by prioritizing running over strict scale adherence, particularly evident in the back-to-back measurement of 14.4–14.5 mm for standard OO, which deviates from the scaled spacing of approximately 17.9 mm to prevent derailments on 16.5 mm track. This setup enhances playability, allowing smooth navigation through points and curves, but at the cost of authentic representation that could otherwise highlight fine details like spacing in stationary displays. Compared to prototype engineering tolerances, where critical dimensions like axle journals or boiler fittings were held to within 0.001–0.010 inches for safety and efficiency, OO gauge models incorporate broader allowances—often 0.1–0.5 mm—to balance visual appeal with operational durability. This approach underscores OO's design philosophy: fostering accessible hobby enjoyment through playable models that approximate rather than precisely replicate the exacting standards of full-scale .

Fine-Scale Standards and Variations

Fine-scale standards in OO gauge encompass non-proprietary specifications developed by enthusiast organizations to achieve greater realism in and track dimensions, surpassing the coarser profiles common in commercial models. The Scalefour defines 4mm fine-scale standards, including profiles with shallower flange depths (approximately 0.75–0.95 mm) for improved scale accuracy, compared to the deeper 1.0–1.2 mm flanges typical in commercial models that prioritize durability. These standards emphasize narrower tyre widths and precise back-to-back measurements, such as 14.6–14.8 mm for OO fine-scale wheelsets, to better mimic geometry while maintaining reliable operation on custom track. Key variants within these fine-scale approaches include EM gauge, which employs an 18.2 mm track gauge to more precisely represent the British standard gauge of 4 ft 8.5 in at 4 mm scale, addressing the under-gauge nature of standard OO's 16.5 mm. Conversion from standard OO to EM typically involves adjusting wheel back-to-backs using gauges or replacing wheelsets and axles with finer profiles, often requiring minimal chassis modification for ready-to-run models. Another variant, S4 (also known as P4 or Protofour), utilizes a 18.83 mm track gauge for exact adherence to the 1:76.2 scale ratio, enabling fully prototypical track and wheel interactions. S4 conversions from OO follow similar processes, including wheelset replacement and potential track rebuilding with scale sleeper spacing, though they demand greater precision in suspension and alignment for smooth running. Supporting these standards are specialized tools and techniques, such as Ultrascale wheels engineered for OO fine-scale, EM, and S4 with accurate profiles and materials like or tyres to reduce wear and enhance realism. Exactoscale track components provide prototypical rail heights and chair details, allowing modellers to hand-lay custom layouts that conform to fine-scale tolerances. remains a core technique for assembling these layouts, enabling secure joints between sleepers, rails, and baseboards while incorporating check rails and flangeways sized for fine flanges, typically 1.0 mm wide. These standards are upheld by dedicated communities, including the Scalefour Society and the EM Gauge Society, which provide guidelines, conversion aids, and events to support modellers seeking enhanced realism beyond commercial OO offerings. While commercial models briefly reference coarser inaccuracies for contrast, fine-scale adoption represents a committed subset of 4mm enthusiasts, fostering innovations in materials and construction for prototypical fidelity.

References

  1. https://www.world-of-railways.co.uk/techniques/what-is-oo-gauge
  2. https://www.gaugemasterretail.com/knowledge/post/model-railway-gauges-vs-model-railway-scales
  3. https://www.keymodelworld.com/article/model-railway-scales-and-gauge-explained
  4. https://doubleogauge.com/a-history-of-oo-gauge/
  5. https://www.scalemodelscenery.co.uk/blogs/can-oo-gauge-trains-run-on-ho-scale-track
  6. https://www.scalemodelscenery.co.uk/blogs/what-are-the-most-popular-model-railway-scales-in-the-uk
  7. https://www.trainshop.co.uk/blog/post/249-why-do-the-british-use-00-gauge-instead-of-h0.html
  8. https://accessmodels.co.uk/blogs/model-railway/oo-gauge-model-railway-advanced-techniques-and-tips
  9. https://www.railwayscenics.com/scale_and_gauges.php
  10. https://railroadrails.com/knowlege/railway-track-gauge/
  11. https://www.world-of-railways.co.uk/techniques/model-railway-scales-and-gauges-explained
  12. https://www.trainshop.co.uk/blog/post/1374-why-is-the-uk-railway-scale-called-00.html
  13. https://www.keymodelworld.com/article/model-railway-scales-and-gauges-explained
  14. https://www.morop.org/images/NEM_register/NEM_E/nem310_en_2009_20111116.pdf
  15. https://www.angelfire.com/clone/rail/flange.html
  16. https://dcc-ex.com/reference/hardware/wire-gauge.html
  17. https://www.keymodelworld.com/article/which-sectional-track-system-choose-oo-gauge
  18. https://www.trains.com/mrr/how-to/build-model-railroad/should-you-use-flextrack-or-sectional-track/
  19. https://www.brightontoymuseum.co.uk/index/Category:Bing_Table_Railway
  20. https://emgs.org/about-em/
  21. https://www.ngaugeforum.co.uk/SMFN/index.php?topic=58250.0
  22. https://www.world-of-railways.co.uk/techniques/a-guide-to-dcc-decoders
  23. https://www.ukmodelshops.co.uk/clubs.html
  24. https://www.rmweb.co.uk/
  25. https://www.southportmodelrailwayvillage.co.uk/
  26. https://www.modelbuildings.org/
  27. https://www.trains.com/mrr/news-reviews/news/hornby-study-finds-health-benefits-of-model-railroading/
  28. https://jpjenkins.com/wp-content/uploads/2025/03/45575-HORNBY-%25E2%2580%2593-AR24-WEB-11.11.24.pdf
  29. https://uk.hornby.com/products/flying-scotsman-train-set-r1255m
  30. https://uk.hornby.com/catalogue/collections/flying-scotsman
  31. https://www.gaugemasterretail.com/brands/bachmann
  32. https://news.bachmann.co.uk/2024/09/product-highlight-oo-scale-western-wagons/
  33. https://www.kernowmodelrailcentre.com/c/1252/Bachmann
  34. https://www.dapol.co.uk/pages/about-us
  35. https://peco-uk.com/en-us/collections/track
  36. https://www.keymodelworld.com/oo-gauge
  37. https://www.research-tree.com/newsfeed/article/hornby-plc-acquisition-1248888
  38. https://www.investegate.co.uk/announcement/rns/hornby--hrn/notice-of-gm-and-disposal-of-interest/8529422
  39. https://www.dccconcepts.com/product/back-to-back-ooho-standard-14-5mm/
  40. https://www.model-engineer.co.uk/forums/topic/workshop-working-tolerances/
  41. https://www.scalefour.org/
  42. https://85a.uk/00-sf/setting_00_wheels.php
  43. http://rastall.com/railway/mr-interface.html
  44. https://www.scalefour.org/moving-to-p4/a-modelling-philosophy
  45. https://exactoscale.com/
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