AMTK
| Amtrak | 116 |
BDRV
| Belvidere & Delaware Railroad | 2 |
BO
| Baltimore & Ohio | 4 |
CLXX
| Carload Express | 9 |
CNW
| Chicago & Northwestern | 1 |
CR
| Conrail | 32 |
CSX
| CSX Railroad | 90 |
CWRX
| CWR TRANSPORTATION CO. | 31 |
DL
| Delaware-Lackawanna Railroad Company | 3 |
ERIE
| Erie Railroad | 3 |
ESPN
| East Penn Railroad | 1 |
FTSX
| Fairmont Tamper | 9 |
GREX
| Georgetown Rail Equipment Company | 22 |
HZGX
| Herzog Contracting Corporation | 9 |
LBFX
| L B Foster Co | 29 |
LMIX
| Loram Maintenance of Way Inc. | 27 |
MDDE
| Maryland and Delaware Railroad | 3 |
ME
| Morristown & Erie Railroad | 18 |
MERR
| MERR | 2 |
MNCR
| Metro North Commuter Railway | 11 |
MNJ
| Middletown & New Jersey Railroad | 1 |
NJT
| New Jersey Transit | 370 |
NJTR
| NJ Transit Rail Operations | 10 |
NS
| Norfolk Southern | 479 |
NSHR
| North Shore | 2 |
NW
| Norfolk & Western | 64 |
NYSW
| New York Susquehanna & Western | 23 |
PACX
| Plasser American Corporation | 1 |
PC
| Penn Central | 3 |
PN
| PN | 2 |
RBMN
| Reading Blue Mountain & Northern | 54 |
RCFX
| Railroad Construction Company | 4 |
RWKX
| RWKX | 2 |
SOU
| Southern | 17 |
SPAX
| Southeastern Pennsylvania Transportation (SEPTA) | 23 |
SRNJ
| Southern Railroad Company of New Jersey | 1 |
SRS
| Sperry Rail Service | 4 |
UP
| Union Pacific Railroad Company | 4 |
WKS
| WKS | 1 |
WRMX
| WRMX | 3 |