Sub-classes
| Sub-Class | Description |
|---|---|
| 20/0 | Standard as-built locos |
| 20/3 (under British Rail) | Small fleet of standard Class 20/0s modified for Peak Forest aggregate workings |
| 20/3 (DRS) | DRS-owned/operated locos fitted with modified cab equipment and fully refurbished |
| 20/9 | Modified from Class 20/0 after withdrawal and sold to Hunslet-Barclay for contract freight use. Few technical differences from standard locos. Later sold to DRS and recently some to HNRC. |
Read more about this topic: British Rail Class 20