Sunbury line

The Sunbury line is a commuter railway line in the city of Melbourne, Victoria, Australia. Operated by Metro Trains Melbourne, it is the city's fifth longest metropolitan railway line at 40.3 kilometres (25.0 mi). The line runs from Flinders Street station in central Melbourne to Sunbury station in the city's north-west, serving 18 stations via North Melbourne, Sunshine, St Albans, and Watergardens. The line operates for approximately 19 hours a day (from approximately 5:00 am to around 12:00 am) with 24 hour service available on Friday and Saturday nights. During peak hour, headways of up to 5 minutes are operated with services every 20–30 minutes during off-peak hours. Train sets typically used on the Sunbury line are the Comeng and Siemens Nexas trainsets and, for two morning peak services, the High Capacity Metro Train.

The Victorian Railways began services in February 1859 on the line originally built to serve the town of Bendigo by the Melbourne, Mount Alexander and Murray River Railway Company. The line was progressively electrified over time, with electrification to St Albans in 1921, to Sydenham in 2002, and finally to Sunbury in 2012.

Since the 2000s, due to the heavily utilised infrastructure of the Sunbury line, improvements and upgrades have been made. Works have included replacing sleepers, upgrading signalling technology, two line extension projects, the construction of new stations, the removal of level crossings, the introduction of new rolling stock, and station accessibility upgrades.

Beginning in 2025, the Sunbury Line will be through routed with the Pakenham and Cranbourne line running through the Metro Tunnel via Town Hall station.

The Melbourne, Mount Alexander and Murray River Railway Company started to build a rail line to Bendigo before operations were taken over by the Department of Railways then the Victorian Railways. The line had been extended as far as Sunbury by February 1859. The line was duplicated between Footscray and Sunbury in early July 1859.

Electrification of the line to St Albans was completed in October 1921, although electrification has already occurred to North Melbourne in May 1919 as part of the Essendon line electrification, and to Footscray in August 1920 as part of the Williamstown line electrification. Electrification shaved 10 minutes off the trip from St Albans to the city.

North Melbourne to South Kensington was quadruplicated in 1924, and South Kensington to Footscray in November 1976. Automatic block signalling was provided between South Kensington and Footscray (and Yarraville on the Williamstown line) in August 1927, from Footscray to West Footscray in October 1927, North Melbourne to South Kensington in June 1928, Sunshine to Albion in July 1929, West Footscray to Sunshine in October 1929, and Albion to St Albans in February 1930, thus resulting in the entire electrified line being provided with this signalling.

On 27 January 2002, electrification of the St Albans line was extended along the regional V/Line tracks to Sydenham. The Sydenham electrification resulted in the closure of the original Sydenham station; a new station was built 600 metres south and named after the nearby Watergardens Town Centre. Additionally, another station was constructed in St Albans called Keilor Plains.