Description
In the late 1980s, British Rail (BR) was extending the electrification north from London Liverpool Street towards Cambridge. Included in this plan was the construction of new branch line, diverging from the mainline at Stansted Mountfitchet, to serve the newly built Stansted Airport, which opened in 1991. Therefore, BR decided to build a dedicated fleet of units to work the new Stansted Express service.
To reduce costs, the Class 322 units were built to the same design as the successful Class 321 units, which were still under construction for services on the GEML and WCML. Despite the Stansted route falling under the jurisdiction of Network SouthEast (NSE), the units were delivered into service in a special white livery with a broad green band, instead of the more usual NSE blue/red/white livery.
Five 4-car units were built, numbered 322481-485. Each unit consisted of two outer driving trailers, an intermediate trailer, and an intermediate motor. The technical description of the formation of each unit is DTCO+TSO+MSO+DTSO. Individual vehicles are numbered as follows:
- 78163-78167 - DTCO
- 72023-72027 - TSO
- 63137-63141 - MSO
- 77985-77989 - DTSO
The units were also the last of a long line of BR multiple units to be based on the Mark 3 bodyshell design.
Read more about this topic: British Rail Class 322
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