AA
| Ann Arbor | 1 |
BNSF
| BNSF Railway | 5 |
BO
| Baltimore & Ohio | 2 |
CN
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 2 |
CP
| Canadian Pacific Railway | 14 |
CR
| Conrail | 10 |
CSX
| CSX Railroad | 28 |
DB
| Deutsche Bahn | 1 |
EJE
| Elgin Joliet and Eastern | 1 |
GREX
| Georgetown Rail Equipment Company | 4 |
HZGX
| Herzog Contracting Corporation | 5 |
IC
| Illinois Central | 1 |
ICG
| Illinois Central Gulf | 1 |
LMIX
| Loram Maintenance of Way Inc. | 19 |
MKT
| Missouri-Kansas-Texas | 1 |
NALX
| Nalco Chemical Co | 1 |
NS
| Norfolk Southern | 10 |
RELA
| RELA | 1 |
SP
| Southern Pacific | 11 |
SPAX
| Southeastern Pennsylvania Transportation (SEPTA) | 3 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
SRGX
| SRGX | 1 |
UP
| Union Pacific Railroad Company | 6 |