AA
| Ann Arbor | 2 |
ACL
| Atlantic Coast Line | 1 |
AMTK
| Amtrak | 3 |
BH
| Bath & Hammondsport | 1 |
BM
| Boston & Maine | 8 |
BN
| Burlington Northern | 7 |
BO
| Baltimore & Ohio | 1 |
CN
| Canadian National Railways | 7 |
CNJ
| Central Rail Road of New Jersey | 1 |
CNW
| Chicago & Northwestern | 4 |
CO
| Chesapeake & Ohio | 6 |
COFP
| COFP | 2 |
CP
| Canadian Pacific Railway | 5 |
CR
| Conrail | 42 |
CRIP
| Chicago Rock Island & Pacific | 1 |
CSS
| Chicago South Shore And South Bend | 1 |
CSX
| CSX Railroad | 21 |
CV
| Central Vermont | 2 |
CWRC
| CENTRAL WISCONSIN RAILROAD | 1 |
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 |
GTW
| Grand Trunk Western | 1 |
IC
| Illinois Central | 4 |
ICG
| Illinois Central Gulf | 8 |
IORY
| Indiana & Ohio | 1 |
KCS
| Kansas City Southern | 1 |
KCSM
| Kansas City Southern De Mexico | 1 |
LMIX
| Loram Maintenance of Way Inc. | 1 |
MCIX
| SSI Mobley Company Incorporated (M of W) | 1 |
MEC
| Maine Central | 3 |
MILW
| Milwaukee Road | 1 |
MKT
| Missouri-Kansas-Texas | 2 |
MP
| Missouri Pacific | 2 |
NECR
| New England Central | 1 |
NS
| Norfolk Southern | 20 |
NW
| Norfolk & Western | 45 |
NYC
| New York Central | 2 |
PAL
| Paducah & Louisville | 1 |
PC
| Penn Central | 2 |
PJ
| PJ | 1 |
PLE
| Pittsburgh & Lake Erie | 1 |
PPR
| PPR | 1 |
PRR
| Pennsylvania Railroad | 3 |
PS
| Pittsburg and Shawmut Railroad Company | 3 |
PTM
| Portland Terminal | 1 |
RWCX
| RWC Incorporated | 2 |
SBD
| Seaboard System | 9 |
SCL
| Seaboard Coast Line | 3 |
SOO
| Soo Line | 1 |
SOU
| Southern | 22 |
SP
| Southern Pacific | 1 |
TRAX
| RailAmerica | 1 |
TZPR
| Tazewell & Peoria Railroad | 1 |
UP
| Union Pacific Railroad Company | 4 |
USAF
| US Air Force | 1 |
VTR
| Vermont Railway | 1 |
WAB
| Wabash | 6 |
WE
| Wheeling & Lake Erie | 1 |
WM
| Western Maryland | 1 |