BAR
| Bangor & Aroostook | 1 |
BN
| Burlington Northern | 2 |
BO
| Baltimore & Ohio | 2 |
CN
| Canadian National Railways | 6 |
CNJ
| Central Rail Road of New Jersey | 1 |
CP
| Canadian Pacific Railway | 6 |
CR
| Conrail | 13 |
CSX
| CSX Railroad | 1 |
DH
| Delaware & Hudson | 3 |
EL
| Erie Lackawanna | 3 |
GN
| Great Northern | 1 |
IATR
| Iowa Traction Railroad Company | 2 |
KCS
| Kansas City Southern | 4 |
KCSR
| KCSR | 1 |
LI
| Long Island Rail Road Company | 4 |
LMIX
| Loram Maintenance of Way Inc. | 4 |
NS
| Norfolk Southern | 1 |
NYCT
| NYCT | 3 |
NYSW
| New York Susquehanna & Western | 1 |
PC
| Penn Central | 4 |
SOO
| Soo Line | 1 |
SOU
| Southern | 1 |
TC
| Temple & Central Texas | 1 |
UP
| Union Pacific Railroad Company | 2 |