Midland Main Line

The Midland Main Line (MML) is a major railway line between London St Pancras and Sheffield, via Leicester, Derby and Chesterfield; a spur of the line terminates at Nottingham.

Express passenger services on the line are operated by East Midlands Railway. The line is electrified between St Pancras and Wigston, south of Leicester, and the section south of Bedford forms a branch of the northern half of the Thameslink network, with a semi-fast service to Brighton and other suburban services. A northern part of the route, between Derby and Chesterfield, also forms part of the Cross Country Route operated by CrossCountry. Tracks from Nottingham to Leeds, via Barnsley and Sheffield, are shared with Northern Trains. East Midlands Railway also operates regional and local services using parts of the line.

The Midland Main Line was undergoing a major upgrade of new digital signalling and full line electrification from London to Sheffield but this was indefinitely paused in 2025. High Speed 2 was planned to branch onto the Midland Main Line at East Midlands Parkway.

The Midland Main Line was built in stages between the 1830s and the 1870s. The earliest section was opened by the Midland Counties Railway between Nottingham and Derby on 4 June 1839. On 5 May 1840, the section of the route from Trent Junction to Leicester was opened.

The line at Derby was joined on 1 July 1840 by the North Midland Railway to Leeds Hunslet Lane, via Chesterfield, Rotherham Masborough, Swinton and Normanton.

On 10 May 1844, the North Midland Railway, the Midland Counties Railway and the Birmingham and Derby Junction Railway merged to form the Midland Railway.

Without its own route to London, the Midland Railway relied upon a junction at Rugby, with the London and Birmingham Railway line for access to the capital at London Euston. By the 1850s, the junction at Rugby had become severely congested. The Midland Railway employed Thomas Brassey to construct a new route from Leicester to Hitchin, via Kettering, Wellingborough and Bedford. This gave access to London via the Great Northern Railway from Hitchin. The Crimean War resulted in a shortage of labour and finance; only £900,000 (equivalent to £84,211,022 in 2023) was available for the construction, approximately £15,000 for each mile (equivalent to £1,403,517 in 2023. To reduce construction costs, the railway followed natural contours, resulting in many curves and gradients. Seven bridges and one tunnel were required, with 60 ft (18 m) cuttings at Desborough and Sharnbrook. There are also major summits at Kibworth, Desbrough and at Sharnbrook, where a 1 in 119 gradient from the south over 3 miles (4.8 km) takes the line to 340 feet (104 m) above sea level. This route opened for coal traffic on 15 April 1857, goods on 4 May, and passengers on 8 May. The section between Leicester and Bedford is still part of the Midland Main Line.

While this took some of the pressure off the route through Rugby, the GNR insisted that passengers for London alight at Hitchin, buying tickets in the short time available, to catch a GNR train to finish their journey. James Allport arranged a seven-year deal with the GN to run into Kings Cross for a guaranteed £20,000 a year (equivalent to £1,870,000 in 2023). Through services to London were introduced in February 1858.