AMTK
| Amtrak | 1 |
ATSF
| Atchison Topeka & Santa Fe | 8 |
BM
| Boston & Maine | 1 |
BN
| Burlington Northern | 8 |
BNSF
| BNSF Railway | 1 |
BRC
| Belt Railway of Chicago | 3 |
CN
| Canadian National Railways | 9 |
CNW
| Chicago & Northwestern | 1 |
CP
| Canadian Pacific Railway | 9 |
CR
| Conrail | 2 |
CSX
| CSX Railroad | 9 |
GLIX
| GLIX | 2 |
GREX
| Georgetown Rail Equipment Company | 5 |
HATX
| Helm Financial Corporation | 1 |
HZGX
| Herzog Contracting Corporation | 50 |
MEC
| Maine Central | 1 |
MILW
| Milwaukee Road | 6 |
MWAX
| Martin Marietta Materials Incorporated | 5 |
MWCX
| Midwest Railcar Corporation | 1 |
NERX
| Transportation Management Services Incorporated | 2 |
NS
| Norfolk Southern | 6 |
PMRX
| Progress Metal Reclamation Company | 4 |
SI
| Union Pacific Railroad Company (Spokane International) | 3 |
SOO
| Soo Line | 5 |
SOU
| Southern | 1 |
SSAM
| Sault Ste. Marie Bridge Company (Canadia | 3 |
UP
| Union Pacific Railroad Company | 4 |
WFRX
| WELLS FARGO RAIL CORPORATION | 2 |
WP
| Western Pacific | 1 |
WSOR
| Wisconsin & Southern | 5 |