The Eastern & Atlantic numbering system was developed by Howard White, similar to the classification system.
The first 1150 numbers were reserved for express passenger locomotives, while 1151-2500 were reserved for slower passenger locomotives. 2501-5300 were reserved for dual purpose locomotives. 5301-8000 were reserved for freight-only locomotives. 8001-8300 were reserved for bankers, 8301-8700 were reserved for Transfer locomotives, and 8701-9700 were reserved for switchers.
Numbers[]
| Class | Numbers | Notes |
|---|---|---|
| 4F2v10f Class | 250-499 | |
| 4F2v20fa Class | 640-714 | |
| 4H4v12af Class | 720-734 | |
| 4D2p8 Class | 1270-1364 | |
| 2F2p6t Class | 1600-1699 | |
| 2H2p6w Class | 1845-1864 | |
| 4DF4p14dfa Class | 1915-1919 | |
| 4Fk7 Class | 2750-2859 | |
| 2H2k1U Class | 3230-3355 | |
| 2Jk18f Class | 3400-3579 | |
| 2J4k25fch Class | 4000-4219 | |
| 4DD4Ek6 Class | 4236-4269 | |
| 4HH4Ek9 Class | 4500-4549 | |
| 4HH4Ek9n Class | 4550-4599 | |
| M3 Class | 5871-6000 | |
| 2JJ2m9yf Class | 5970-5975 | |
| 2J2m21f Class | 6000-6089 | |
| DD(gs)m17o Class | 6090-6144 | |
| 2HHm11y Class | 6145-6149 | |
| 4J2m4 Class | 6150-6173, 6175-6184 | 2 Runs |
| 4HHHH4m19y Class | 6174-6175 | |
| 2F4m9t Class | 6300-6399 | |
| 4HJ4m16yfo Class | 6400-6414 | |
| 2FF4m18yf Class | 6415-6429 | |
| 4DF4l13df Class | 6430-6484, 6600-6614 | 2 Runs |
| 2Hm12U Class | 6485-6514, 6615-6634 | 2 Runs |
| 4FF4Em10 Class | 6570-6599 | |
| 4N6m19f Class | 6600-6634 | |
| 4FFFFF4l37i Class | 6940-6949 | |
| H22FF22Hb8r Class | 8215-8218 | |
| FFe5y Class | 8345-8409 | |
| HHe9y Class | 8410-8450 | |
| HHs10y Class | 8900-8915 | |
| Ls7 Class | 9200-9224 |