BN
| Burlington Northern | 2 |
CN
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 3 |
CSX
| CSX Railroad | 1 |
ICG
| Illinois Central Gulf | 1 |
MP
| Missouri Pacific | 3 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 2 |
UP
| Union Pacific Railroad Company | 2 |
WE
| Wheeling & Lake Erie | 1 |