Sub-classes
In the 1980s the Class 37 locomotives were extensively refurbished - from that point 37/0 refers to the original version. The work took place at BREL in Crewe except for the 37/3 subclass whose bogies were replaced at various depots.
| Sub-class | Description |
|---|---|
| 37/0 | Locomotives which remained unmodified after other sub-classes were created |
| 37/3 | Locomotives which were rebogied but not refurbished |
| 37/4 | Refurbished, rewired, English Electric generator replaced with Brush alternator, electric train supply (ETS) fitted |
| 37/5 | Refurbished, rewired, English Electric generator replaced with Brush alternator |
| 37/6 | Locomotives from Class 37/5 further modified with through ETS wiring and RCH jumper cables |
| 37/7 | Refurbished, rewired, English Electric generator replaced with GEC G564AZ or Brush alternator, additional weight added |
| 37/9 | Refurbished, rewired, English Electric generator replaced with Brush alternator, new engines: Mirrlees MB275Tt or Ruston RK270Tt |
Read more about this topic: British Rail Class 37