ACL
| Atlantic Coast Line | 2 |
ATW
| Atlantic and Western | 2 |
BN
| Burlington Northern | 3 |
BNSF
| BNSF Railway | 3 |
BO
| Baltimore & Ohio | 11 |
CBQ
| Chicago Burlington & Quincy | 1 |
CIC
| Cedar Rapids & Iowa City | 1 |
CIMX
| CIMX | 1 |
CN
| Canadian National Railways | 1 |
CO
| Chesapeake & Ohio | 1 |
CR
| Conrail | 2 |
CRBX
| OmniSource Corporation | 1 |
CRIP
| Chicago Rock Island & Pacific | 3 |
CS
| Colorado & Southern | 6 |
CSS
| Chicago South Shore And South Bend | 3 |
CSX
| CSX Railroad | 24 |
CYDX
| Conrad Yelvington Distributors | 1 |
DJJX
| Joseph Transportation Incorporated | 1 |
DME
| Dakota, Minnesota and Eastern | 1 |
DTI
| Detroit Toledo & Ironton | 1 |
EAMX
| Everest Railcar Services, Inc | 2 |
EL
| Erie Lackawanna | 3 |
FEC
| Florida East Coast | 3 |
GN
| Great Northern | 8 |
IC
| Illinois Central | 1 |
ITC
| Illinois Terminal Railroad | 2 |
LN
| Louisville & Nashville | 7 |
LRWN
| Little Rock & Western | 1 |
LXOH
| Knoxville & Holston River Railroad | 1 |
MKT
| Missouri-Kansas-Texas | 1 |
MMID
| Maryland Midland | 1 |
MP
| Missouri Pacific | 2 |
NKP
| Nickel Plate | 1 |
NP
| Northern Pacific | 3 |
NS
| Norfolk Southern | 1 |
NTKX
| VAE Nortrak North America Incorporated | 1 |
NYC
| New York Central | 5 |
PC
| Penn Central | 8 |
PRR
| Pennsylvania Railroad | 3 |
SBD
| Seaboard System | 7 |
SCL
| Seaboard Coast Line | 12 |
SMIX
| Structural Metals Incorporated | 1 |
SOU
| Southern | 1 |
SP
| Southern Pacific | 2 |
SPSX
| Progress Rail Services Corp | 1 |
UP
| Union Pacific Railroad Company | 1 |
WM
| Western Maryland | 2 |