BN
| Burlington Northern | 1 |
CN
| Canadian National Railways | 1 |
CNA
| Canadian National Railways | 1 |
CPI
| Canadian Pacific Railway | 1 |
IC
| Illinois Central | 1 |
MILW
| Milwaukee Road | 2 |
PC
| Penn Central | 1 |
PHD
| Port Huron and Detroit Railroad Company | 1 |
RBOX
| Railbox Company | 1 |
SPS
| Spokane Portland & Seattle | 1 |