ALS
| Alton & Southern Railway | 2 |
ATS
| ATS | 1 |
CN
| Canadian National Railways | 2 |
GRPS
| GRPS | 1 |
GWMR
| GWMR | 1 |
HZGX
| Herzog Contracting Corporation | 1 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
MP
| Missouri Pacific | 11 |
MPX
| COLUMBIAN CARBON CO., MAGNETIC PIGMENT DIV. | 2 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 15 |