AMTK
| Amtrak | 2 |
BN
| Burlington Northern | 16 |
BNSF
| BNSF Railway | 15 |
BO
| Baltimore & Ohio | 1 |
CBQ
| Chicago Burlington & Quincy | 2 |
CC
| Chicago Central & Pacific | 2 |
CNW
| Chicago & Northwestern | 4 |
CR
| Conrail | 4 |
DRGW
| Denver & Rio Grande Western | 25 |
EJE
| Elgin Joliet and Eastern | 2 |
EMCO
| EMCO | 1 |
FTSX
| Fairmont Tamper | 1 |
GWR
| Great Western Railway Company | 1 |
IAIS
| Iowa Interstate | 4 |
LMIX
| Loram Maintenance of Way Inc. | 2 |
MILW
| Milwaukee Road | 1 |
MJ
| Manufacturers'' Junction Railway Company | 3 |
MJRY
| MJRY | 3 |
MP
| Missouri Pacific | 3 |
NS
| Norfolk Southern | 2 |
PC
| Penn Central | 2 |
SOO
| Soo Line | 1 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 9 |
SSW
| St Louis Southwestern (Cotton Belt) | 11 |
UP
| Union Pacific Railroad Company | 4 |