AMTK
| Amtrak | 1 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
BN
| Burlington Northern | 1 |
BNSF
| BNSF Railway | 1 |
BO
| Baltimore & Ohio | 4 |
BR
| Buffalo and Pittsburgh | 1 |
CGW
| Chicago Great Western | 1 |
CIL
| Chicago Indianapolis & Louisville (Monon | 1 |
CN
| Canadian National Railways | 13 |
CNW
| Chicago & Northwestern | 6 |
CO
| Chesapeake & Ohio | 2 |
CP
| Canadian Pacific Railway | 1 |
CR
| Conrail | 26 |
CSX
| CSX Railroad | 52 |
DRGW
| Denver & Rio Grande Western | 1 |
EJE
| Elgin Joliet and Eastern | 1 |
GMS
| GMS | 1 |
GREX
| Georgetown Rail Equipment Company | 6 |
HZGX
| Herzog Contracting Corporation | 8 |
IC
| Illinois Central | 11 |
ICG
| Illinois Central Gulf | 4 |
INRD
| Indiana Railroad | 1 |
KCS
| Kansas City Southern | 1 |
LMIX
| Loram Maintenance of Way Inc. | 3 |
LN
| Louisville & Nashville | 6 |
MILW
| Milwaukee Road | 1 |
MP
| Missouri Pacific | 3 |
NCSL
| Nashville Chattanooga & St Louis | 1 |
NS
| Norfolk Southern | 44 |
NW
| Norfolk & Western | 61 |
NYC
| New York Central | 5 |
PACX
| Plasser American Corporation | 1 |
RJCC
| R.J. Corman Railroad/Kentucky Lines | 1 |
RWCX
| RWC Incorporated | 16 |
SCL
| Seaboard Coast Line | 1 |
SOU
| Southern | 8 |
SP
| Southern Pacific | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
TDIX
| Transdynamic Leasing | 1 |
UP
| Union Pacific Railroad Company | 29 |
VMV
| VMV | 1 |