Description
The table below illustrates the original formation, numbering and areas of use:
| Sub-Class | Built | Unit Numbers | BDTSOL | MBSO | TSO | DTCOL | Area of Use | |
|---|---|---|---|---|---|---|---|---|
| Original | Later | |||||||
| 312/0 | 1976-78 | 312001-312026 | 312701-312726 | 76949-76974 | 62484-62509 | 71168-71193 | 78000-78025 | Great Northern |
| 312/1 | 1975-76 | 312101-312119 | 312781-312799 | 76975-76993 | 62510-62528 | 71194-71212 | 78026-78044 | Great Eastern |
| 312/2 | 1976 | 312201-312204 | 312727-312730 | 76994-76997 | 62657-62660 | 71277-71280 | 78045-78048 | West Midlands |
These units were based on the Class 310, used on the suburban services out of London Euston. The only significant difference between the various sub-classes was that the 312/1 units were also equipped to work on the 6.25 kV AC overhead electrification system used on parts of the Great Eastern Main Line and London, Tilbury and Southend Railway networks.
Read more about this topic: British Rail Class 312
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