Class 20s were 1000hp diesel locomotives used mainly for weedkilling trains on the line. .
 Photo by AJF 1 from Flickr | ||
| Locomotive Number | Build Date (Batch) | Location Built | Notes |
| 20075 | |||
| 20187 | |||
| 20902 |
B&FRHT (Registered no: 11668316) Garth Celyn, Penrhyndeudraeth, Wales, LL48 6RF
