Bletchley TMD

Traction maintenance depot in the UK

Bletchley TMD is a railway traction maintenance depot situated in Bletchley, Milton Keynes in Buckinghamshire, to the north east of Bletchley railway station, on a siding off the Marston Vale line. The depot is operated by West Midlands Trains (trading as London Northwestern Railway).

The original London and North Western Railway locomotive shed in Bletchley was a wooden and galvanised iron building that catered for some twelve engines, with three roads accommodated within the facility. However during the 1870s the shed collapsed in a gale, burying stabled locomotives and was replaced by two gabled roof spans with numerous ducts and chimneys. Bletchley had won awards for the reliability of its trains as recently as March 2007, and was said to deliver six times better than average reliability. London Midland phased in the fleet of 37 Class 350/2 Desiro trains, which are maintained by Siemens at the Kings Heath Depot in Northampton. These replaced the Silverlink Class 321 fleet which had been serviced at Bletchley. Bletchley depot was bought back into use by Vivarail in September 2018 to maintain its Class 230 diesel units. These were used exclusively on the Marston Vale Line until the company failed and the trains were withdrawn in December 2022. In July 2023, three British Rail Class 150 were transferred to Bletchley TMD, in preparation for their introduction to service on the Marston Vale Line.

In April 2024, West Midlands Trains announced that it had placed a £66M contract to upgrade the depot. When completed in autumn 2025, Bletchley TMD will "become the principal maintenance base for WMT’s newly procured Class 730 Aventra fleet".