AMTK
| Amtrak | 56 |
BDRV
| Belvidere & Delaware Railroad | 1 |
BNSF
| BNSF Railway | 3 |
BO
| Baltimore & Ohio | 1 |
BR
| Buffalo and Pittsburgh | 1 |
CBH
| CBH | 1 |
CMW
| CMW | 1 |
CO
| Chesapeake & Ohio | 10 |
CR
| Conrail | 23 |
CSX
| CSX Railroad | 389 |
DL
| Delaware-Lackawanna Railroad Company | 1 |
ET
| ET | 2 |
EX
| EX | 1 |
FLR
| Fife Lake Railway | 1 |
FTSX
| Fairmont Tamper | 1 |
IRYM
| Illinois Railway Museum | 3 |
LIMX
| CHEMICAL LIME CO. | 1 |
LMIX
| Loram Maintenance of Way Inc. | 19 |
MT
| Mississippi and Tennessee RailNet Incorporated | 3 |
MTA
| NYC Transit | 2 |
NJT
| New Jersey Transit | 28 |
NS
| Norfolk Southern | 49 |
NSSX
| National Salvage and Service Corporation | 7 |
NYC
| New York Central | 12 |
NYSW
| New York Susquehanna & Western | 3 |
PKP
| Polish Railways | 3 |
PNRR
| Pennsylvania Northeastern | 3 |
PR
| Palmetto Railways | 1 |
PRRX
| PRRX | 1 |
RBMN
| Reading Blue Mountain & Northern | 39 |
RJCR
| RJ Corman | 2 |
RKCX
| Knox Kershaw Incorporated | 11 |
RTM
| RTM | 1 |
SBD
| Seaboard System | 2 |
SC
| SC | 1 |
SIRT
| Staten Island Rapid Transit | 1 |
SLRS
| SMS Rail Service Incorporated | 3 |
SMS
| SMS | 1 |
SOU
| Southern | 2 |
SPAX
| Southeastern Pennsylvania Transportation (SEPTA) | 15 |
SPSX
| Progress Rail Services Corp | 2 |
SRS
| Sperry Rail Service | 1 |
UP
| Union Pacific Railroad Company | 2 |
VSR
| Valley & Siletz RR | 2 |