MP
| Missouri Pacific | 2 |
NCNG
| NCNG | 1 |
SP
| Southern Pacific | 8 |
SPAX
| Southeastern Pennsylvania Transportation (SEPTA) | 2 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
TFM
| Kansas City Southern De Mexico | 1 |
UP
| Union Pacific Railroad Company | 2 |
WECX
| Westinghouse Electric Corporation | 4 |