AMTK
| Amtrak | 77 |
ATEX
| Asplundh Tree Expert Co Railroad Division | 3 |
BDRV
| Belvidere & Delaware Railroad | 2 |
BM
| Boston & Maine | 1 |
BNSF
| BNSF Railway | 3 |
BO
| Baltimore & Ohio | 2 |
BR
| Buffalo and Pittsburgh | 1 |
BRW
| Black River And Western | 2 |
CBH
| CBH | 1 |
CMW
| CMW | 1 |
CO
| Chesapeake & Ohio | 11 |
CR
| Conrail | 63 |
CSX
| CSX Railroad | 531 |
DBI
| DBI | 1 |
DL
| Delaware-Lackawanna Railroad Company | 3 |
ET
| ET | 2 |
ETLC
| ETLC | 1 |
EX
| EX | 1 |
FLR
| Fife Lake Railway | 1 |
FTSX
| Fairmont Tamper | 2 |
IRYM
| Illinois Railway Museum | 3 |
KBR
| KBR | 1 |
LIMX
| CHEMICAL LIME CO. | 4 |
LMIX
| Loram Maintenance of Way Inc. | 26 |
MCER
| Massachusetts Central Railroad | 1 |
MEC
| Maine Central | 2 |
MPCX
| Michels Corporation | 2 |
MT
| Mississippi and Tennessee RailNet Incorporated | 3 |
MTA
| NYC Transit | 2 |
NECR
| New England Central | 2 |
NJT
| New Jersey Transit | 46 |
NS
| Norfolk Southern | 103 |
NSSX
| National Salvage and Service Corporation | 9 |
NYC
| New York Central | 15 |
NYSW
| New York Susquehanna & Western | 4 |
PGB
| PGB | 1 |
PKP
| Polish Railways | 5 |
PNRR
| Pennsylvania Northeastern | 9 |
PR
| Palmetto Railways | 1 |
PRRX
| PRRX | 1 |
RBMN
| Reading Blue Mountain & Northern | 42 |
RBR
| RBR | 1 |
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) | 41 |
SPSX
| Progress Rail Services Corp | 2 |
SRNJ
| Southern Railroad Company of New Jersey | 1 |
SRS
| Sperry Rail Service | 4 |
TRWR
| TRWR | 1 |
UP
| Union Pacific Railroad Company | 3 |
VSR
| Valley & Siletz RR | 2 |
VT
| Virginia & Truckee | 1 |