ATEX
| Asplundh Tree Expert Co Railroad Division | 2 |
BN
| Burlington Northern | 6 |
BNSF
| BNSF Railway | 5 |
CGW
| Chicago Great Western | 1 |
CN
| Canadian National Railways | 2 |
CNW
| Chicago & Northwestern | 2 |
CP
| Canadian Pacific Railway | 5 |
CRDX
| Chicago Freight Car Leasing Company | 1 |
CSX
| CSX Railroad | 6 |
CWRX
| CWR TRANSPORTATION CO. | 11 |
DME
| Dakota, Minnesota and Eastern | 1 |
DRGW
| Denver & Rio Grande Western | 1 |
HZGX
| Herzog Contracting Corporation | 12 |
IAIS
| Iowa Interstate | 2 |
LMIX
| Loram Maintenance of Way Inc. | 2 |
MNN
| Minnesota Northern Railroad Incorporated | 1 |
MP
| Missouri Pacific | 1 |
RRVW
| Red River Valley and Western Railroad | 1 |
SBD
| Seaboard System | 1 |
SOO
| Soo Line | 3 |
SP
| Southern Pacific | 2 |
SPMW
| Southern Pacific Maintenance of Way | 2 |
UP
| Union Pacific Railroad Company | 6 |