AMTK
| Amtrak | 1 |
ARR
| Alaska Railroad | 2 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
AWP
| Atlanta & West Point | 2 |
BBRI
| BBRI | 2 |
BCOL
| Canadian National Railways | 1 |
BNSF
| BNSF Railway | 1 |
CBQ
| Chicago Burlington & Quincy | 12 |
CC
| Chicago Central & Pacific | 1 |
CGW
| Chicago Great Western | 1 |
CIM
| Chicago And Illinois Midland | 2 |
CN
| Canadian National Railways | 4 |
CP
| Canadian Pacific Railway | 1 |
CR
| Conrail | 2 |
CSS
| Chicago South Shore And South Bend | 1 |
CSX
| CSX Railroad | 8 |
DMIR
| Duluth Missabe & Iron Range | 2 |
DTI
| Detroit Toledo & Ironton | 1 |
EJE
| Elgin Joliet and Eastern | 2 |
EL
| Erie Lackawanna | 1 |
FCP
| Ferrocarril Del Pacifico | 1 |
GN
| Great Northern | 2 |
IC
| Illinois Central | 2 |
KCS
| Kansas City Southern | 1 |
MILW
| Milwaukee Road | 3 |
MNRR
| Modoc Northern Railroad Company | 1 |
MNS
| Minneapolis Northfield & Southern | 1 |
MP
| Missouri Pacific | 1 |
NALX
| Nalco Chemical Co | 1 |
NH
| New Haven | 1 |
NW
| Norfolk & Western | 5 |
NYC
| New York Central | 2 |
PC
| Penn Central | 2 |
PSAP
| Puget Sound and Pacific Railroad Company | 1 |
RFP
| Richmond Fredericksburg & Potomac | 2 |
RHBX
| RHBX | 1 |
SOO
| Soo Line | 2 |
SOU
| Southern | 6 |
SP
| Southern Pacific | 2 |
SPMW
| Southern Pacific Maintenance of Way | 1 |
SPSX
| Progress Rail Services Corp | 1 |
SVRR
| Shamokin Valley Railroad Company | 3 |
WM
| Western Maryland | 3 |
WRA
| Western Railway of Alabama | 1 |
WT
| Wrightsville & Tennille | 1 |