Description
The units were built in two batches. In the first batch, a total of 123 locomotive-hauled Mark 1 carriage were converted comprising 63 TSO to DTSO on Lot 30764, 32 BSK to TBSK on Lot 30765 and 28 FK to TFK on Lot 30766.
In the second batch, 14 locomotive-hauled carriages were rebuilt comprising 2 BSK to TBSK on Lot 30855, 6 FK to TFK on Lot 30856, and 6 TSO to DTSO on Lot 30857. This work included converting the three 3TC units to 4TC. The 1974 build units were fitted with double-glazed windows (except for the sliding toplights) as fitted to contemporary CIG/BIG stock. They also differed from the 1967 units in having the contemporary CIG/BIG style of seating throughout, as all coaches were new-build.
Individual vehicle numbering is shown in the table below.
| Phase | Class | Type | Unit Nos. | DTSO | TFK | TBSK | DTSO |
|---|---|---|---|---|---|---|---|
| Phase 1 (1966–67) |
Class 491 | 4TC | 401-428 | 76270, 76271-76323 (odd) | 70844-70871 | 70812-70839 | 76332, 76272-76324 (even) |
| Class 492 | 3TC | 301-303 | 76325-76329 (odd) | - | 70840-70842 | 76326-76330 (even) | |
| Spare | 76311 | - | 70843 | - | |||
| Phase 2 (1974) |
Class 491 | 4TC | 429-431 (ex-3TC units) |
- | 71162-71164 | - | - |
| Class 491 | 4TC | 432-434 | 76943-76947 (odd) | 71165-71167 | 70843 (ex-spare), 71160-71161 |
76944-76948 (even) |
Read more about this topic: British Rail Class 438
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