AA
| Ann Arbor | 1 |
ACL
| Atlantic Coast Line | 1 |
ALY
| Allegheny and Eastern Railroad Incorpora | 1 |
BM
| Boston & Maine | 5 |
BN
| Burlington Northern | 7 |
BO
| Baltimore & Ohio | 1 |
CN
| Canadian National Railways | 3 |
CNJ
| Central Rail Road of New Jersey | 1 |
CNW
| Chicago & Northwestern | 3 |
CO
| Chesapeake & Ohio | 3 |
CP
| Canadian Pacific Railway | 2 |
CR
| Conrail | 36 |
CRIP
| Chicago Rock Island & Pacific | 1 |
CSS
| Chicago South Shore And South Bend | 1 |
CSX
| CSX Railroad | 14 |
CV
| Central Vermont | 2 |
DH
| Delaware & Hudson | 7 |
DM
| Detroit & Mackinac | 1 |
DRGW
| Denver & Rio Grande Western | 2 |
DTI
| Detroit Toledo & Ironton | 2 |
EL
| Erie Lackawanna | 2 |
ERIE
| Erie Railroad | 1 |
GREX
| Georgetown Rail Equipment Company | 5 |
GTW
| Grand Trunk Western | 1 |
IC
| Illinois Central | 4 |
ICG
| Illinois Central Gulf | 4 |
IORY
| Indiana & Ohio | 1 |
KCSM
| Kansas City Southern De Mexico | 1 |
LMIX
| Loram Maintenance of Way Inc. | 5 |
MCIX
| SSI Mobley Company Incorporated (M of W) | 1 |
MEC
| Maine Central | 3 |
MILW
| Milwaukee Road | 1 |
MKT
| Missouri-Kansas-Texas | 1 |
MP
| Missouri Pacific | 2 |
NECR
| New England Central | 1 |
NS
| Norfolk Southern | 18 |
NW
| Norfolk & Western | 32 |
NYC
| New York Central | 1 |
PAL
| Paducah & Louisville | 1 |
PC
| Penn Central | 1 |
PJ
| PJ | 1 |
PLE
| Pittsburgh & Lake Erie | 1 |
PRR
| Pennsylvania Railroad | 1 |
PS
| Pittsburg and Shawmut Railroad Company | 3 |
PTM
| Portland Terminal | 1 |
RWCX
| RWC Incorporated | 1 |
SBD
| Seaboard System | 6 |
SCL
| Seaboard Coast Line | 1 |
SOO
| Soo Line | 1 |
SOU
| Southern | 16 |
SP
| Southern Pacific | 1 |
TRAX
| RailAmerica | 1 |
TZPR
| Tazewell & Peoria Railroad | 1 |
UP
| Union Pacific Railroad Company | 2 |
WM
| Western Maryland | 1 |