| A |
an auxiliary unit (slug) that requires another unit for control and/or power |
| A B |
an auxiliary with battery power. It may or may not have a driving cab. |
| A DE |
a diesel-electric unit without driving controls (none currently exist on the system, but class DL5B would now be classified as this type.) |
| DP |
a dual-power (electic & diesel-electric) locomotive |
| DE |
a diesel-electric locomotive. |
| E AC |
a motor that requires AC overhead (ie: class 585) |
| E DC |
a motor that requires DC overhead (ie: class A) |
| E M |
a motor that can operate under both AC or DC power |
| ESB |
a motor with driving controls & a battery for operating over short stretches of unelectrified railway (class ESB) |
| S |
a steam locomotive |