ACL
| Atlantic Coast Line | 1 |
ATSF
| Atchison Topeka & Santa Fe | 5 |
BN
| Burlington Northern | 2 |
CBQ
| Chicago Burlington & Quincy | 1 |
CNW
| Chicago & Northwestern | 1 |
CO
| Chesapeake & Ohio | 1 |
CR
| Conrail | 1 |
GMO
| Gulf Mobile & Ohio | 2 |
GSMR
| Great Smoky Mountains | 1 |
IHB
| Indiana Harbor Belt | 1 |
KCS
| Kansas City Southern | 1 |
LIRC
| Louisville & Indiana | 1 |
MHWA
| Mohawk Adirondack and Northern Railroad | 2 |
MILW
| Milwaukee Road | 2 |
MKT
| Missouri-Kansas-Texas | 3 |
MP
| Missouri Pacific | 2 |
MRL
| Montana Rail Link | 3 |
NS
| Norfolk Southern | 4 |
NW
| Norfolk & Western | 2 |
PRR
| Pennsylvania Railroad | 4 |
SBD
| Seaboard System | 2 |
SLSF
| Saint Louis-San Francisco | 1 |
SOU
| Southern | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
UP
| Union Pacific Railroad Company | 3 |