ACWR
| Aberdeen, Carolina & Western | 1 |
ALAB
| Alabama Railroad | 1 |
BAYL
| Bay Line, LLC | 1 |
BN
| Burlington Northern | 1 |
BO
| Baltimore & Ohio | 8 |
CNW
| Chicago & Northwestern | 1 |
CO
| Chesapeake & Ohio | 5 |
CR
| Conrail | 4 |
CRR
| Clinchfield | 1 |
CS
| Colorado & Southern | 1 |
CSX
| CSX Railroad | 7 |
IHB
| Indiana Harbor Belt | 1 |
LHR
| Lehigh & Hudson River | 2 |
LN
| Louisville & Nashville | 4 |
MAMX
| Mammoet USA, Inc | 1 |
MKT
| Missouri-Kansas-Texas | 1 |
MMID
| Maryland Midland | 1 |
MP
| Missouri Pacific | 1 |
MSRC
| Kansas City Southern | 1 |
NKP
| Nickel Plate | 2 |
NS
| Norfolk Southern | 2 |
NW
| Norfolk & Western | 1 |
NYC
| New York Central | 3 |
PC
| Penn Central | 1 |
PRR
| Pennsylvania Railroad | 1 |
SBD
| Seaboard System | 11 |
SCL
| Seaboard Coast Line | 1 |
UP
| Union Pacific Railroad Company | 1 |
VECX
| VeraSun Energy | 1 |