ARR
| Alaska Railroad | 1 |
ATSF
| Atchison Topeka & Santa Fe | 5 |
BAR
| Bangor & Aroostook | 1 |
BCOL
| Canadian National Railways | 1 |
BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 2 |
CP
| Canadian Pacific Railway | 6 |
DODX
| Department Of Defense | 19 |
ERES
| Erie Western | 1 |
GEX
| General Electric Company | 1 |
GVSR
| Galveston Railroad L.P. | 1 |
HTTX
| TTX Company | 3 |
HZGX
| Herzog Contracting Corporation | 5 |
ICE
| Iowa Chicago and Eastern | 3 |
ITTX
| TTX Company | 7 |
JTTX
| TTX Company | 1 |
KTTX
| TTX Company | 1 |
KWUX
| Siemens Power Corporation | 2 |
MP
| Missouri Pacific | 1 |
MTTX
| TTX Company | 1 |
NP
| Northern Pacific | 4 |
NYC
| New York Central | 1 |
QTTX
| TTX Company | 2 |
SBC
| Ferrocarril Sonora Baja California | 1 |
SCAX
| SOUTHERN CALIFORNIA REGIONAL RAIL AUTHORITY | 2 |
SOO
| Soo Line | 1 |
SP
| Southern Pacific | 6 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 4 |
TOE
| Texas Oklahoma and Eastern RR Company | 1 |
TTDX
| TTX Company - DOD Service Flats | 1 |
TTEX
| TTX Company - Articulated Flat Cars (TOFC/COFC) | 1 |
TTX
| TTX Company | 1 |
UP
| Union Pacific Railroad Company | 2 |
WPRR
| Willamette and Pacific | 1 |
XTTX
| TTX Company | 1 |