CP
| Canadian Pacific Railway | 2 |
CSX
| CSX Railroad | 1 |
CW
| Colorado and Wyoming | 1 |
DODX
| Department Of Defense | 9 |
ECXX
| East Carbon Development Company | 2 |
HTTX
| TTX Company | 3 |
ITTX
| TTX Company | 5 |
JTTX
| TTX Company | 1 |
KRL
| Kasgro Rail Lines | 1 |
KWUX
| Siemens Power Corporation | 1 |
LHFX
| Lehigh Heavy Forge Corporation | 4 |
LMIC
| Lake Michigan & Indiana Railroad | 1 |
NW
| Norfolk & Western | 1 |
OTTX
| TTX Company | 1 |
PTTX
| TTX Company | 3 |
QTTX
| TTX Company | 1 |
RT
| River Terminal Railway Company | 3 |
TTDX
| TTX Company - DOD Service Flats | 1 |
TZPR
| Tazewell & Peoria Railroad | 2 |
XTTX
| TTX Company | 2 |