AMTK
| Amtrak | 24 |
AR
| Aberdeen and Rockfish | 4 |
ATSF
| Atchison Topeka & Santa Fe | 11 |
BN
| Burlington Northern | 38 |
BNSF
| BNSF Railway | 12 |
CN
| Canadian National Railways | 36 |
CNW
| Chicago & Northwestern | 20 |
CO
| Chesapeake & Ohio | 6 |
CP
| Canadian Pacific Railway | 9 |
CR
| Conrail | 91 |
CRDX
| Chicago Freight Car Leasing Company | 14 |
CSX
| CSX Railroad | 253 |
DTI
| Detroit Toledo & Ironton | 2 |
EBT
| East Broad Top | 1 |
EJE
| Elgin Joliet and Eastern | 1 |
FWRY
| Fillmore Western Railway Company | 1 |
HATX
| Helm Financial Corporation | 1 |
HZCX
| HZCX | 1 |
HZGX
| Herzog Contracting Corporation | 509 |
IC
| Illinois Central | 3 |
KO
| Kansas & Oklahoma | 1 |
LGEX
| L.G. Everist Incorporated | 5 |
MRL
| Montana Rail Link | 2 |
MSO
| Michigan Southern | 1 |
NERX
| Transportation Management Services Incorporated | 3 |
NICD
| Northern-Indiana Commuter Transportation | 16 |
NS
| Norfolk Southern | 172 |
NYC
| New York Central | 2 |
RRVW
| Red River Valley and Western Railroad | 12 |
SI
| Union Pacific Railroad Company (Spokane International) | 13 |
SOO
| Soo Line | 11 |
SOU
| Southern | 3 |
SSAM
| Sault Ste. Marie Bridge Company (Canadia | 1 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
TCWR
| Twin Cities and Western | 5 |
UP
| Union Pacific Railroad Company | 229 |
WAMX
| Webb Asset Management | 7 |
WC
| Wisconsin Central | 1 |