AC
| Algoma Central | 1 |
AMTK
| Amtrak | 22 |
AR
| Aberdeen and Rockfish | 4 |
ATSF
| Atchison Topeka & Santa Fe | 11 |
BN
| Burlington Northern | 27 |
BNSF
| BNSF Railway | 9 |
CN
| Canadian National Railways | 13 |
CNW
| Chicago & Northwestern | 22 |
CO
| Chesapeake & Ohio | 5 |
CP
| Canadian Pacific Railway | 9 |
CR
| Conrail | 94 |
CRDX
| Chicago Freight Car Leasing Company | 13 |
CSX
| CSX Railroad | 247 |
DTI
| Detroit Toledo & Ironton | 3 |
EL
| Erie Lackawanna | 20 |
FWRY
| Fillmore Western Railway Company | 1 |
GREX
| Georgetown Rail Equipment Company | 6 |
HATX
| Helm Financial Corporation | 1 |
HZCX
| HZCX | 1 |
HZGX
| Herzog Contracting Corporation | 502 |
IC
| Illinois Central | 5 |
LGEX
| L.G. Everist Incorporated | 5 |
MP
| Missouri Pacific | 2 |
MRL
| Montana Rail Link | 2 |
MSO
| Michigan Southern | 1 |
NERX
| Transportation Management Services Incorporated | 3 |
NICD
| Northern-Indiana Commuter Transportation | 16 |
NS
| Norfolk Southern | 164 |
NW
| Norfolk & Western | 1 |
NYC
| New York Central | 3 |
SI
| Union Pacific Railroad Company (Spokane International) | 13 |
SOO
| Soo Line | 11 |
SOU
| Southern | 2 |
SP
| Southern Pacific | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 1 |
TCWR
| Twin Cities and Western | 2 |
UP
| Union Pacific Railroad Company | 233 |
WAMX
| Webb Asset Management | 2 |
WC
| Wisconsin Central | 6 |