AMTK
| Amtrak | 11 |
ATSF
| Atchison Topeka & Santa Fe | 8 |
BCOL
| Canadian National Railways | 4 |
BN
| Burlington Northern | 2 |
BPRR
| Buffalo and Pittsburgh | 1 |
CN
| Canadian National Railways | 8 |
CP
| Canadian Pacific Railway | 10 |
CR
| Conrail | 17 |
CRDX
| Chicago Freight Car Leasing Company | 1 |
CSX
| CSX Railroad | 1 |
EJE
| Elgin Joliet and Eastern | 1 |
EL
| Erie Lackawanna | 2 |
GREX
| Georgetown Rail Equipment Company | 1 |
HZGX
| Herzog Contracting Corporation | 14 |
LSI
| Lake Superior and Ishpeming Railroad | 1 |
MILW
| Milwaukee Road | 9 |
MKT
| Missouri-Kansas-Texas | 1 |
MRL
| Montana Rail Link | 1 |
NS
| Norfolk Southern | 5 |
RBMN
| Reading Blue Mountain & Northern | 1 |
RRVW
| Red River Valley and Western Railroad | 6 |
SI
| Union Pacific Railroad Company (Spokane International) | 2 |
SOO
| Soo Line | 1 |
SOU
| Southern | 2 |
SSAM
| Sault Ste. Marie Bridge Company (Canadia | 2 |
UP
| Union Pacific Railroad Company | 1 |