AAR
| Association of American Railroads | 5 |
ACL
| Atlantic Coast Line | 4 |
AMTK
| Amtrak | 1 |
ATSF
| Atchison Topeka & Santa Fe | 11 |
CBQ
| Chicago Burlington & Quincy | 1 |
CO
| Chesapeake & Ohio | 1 |
CS
| Colorado & Southern | 5 |
CSX
| CSX Railroad | 3 |
DOTX
| USDOT/Federal Railroad Administration | 1 |
ESNA
| Eureka Springs and North Arkansas | 1 |
ETWN
| ETWN | 1 |
FEC
| Florida East Coast | 3 |
GC
| Georgia Central | 1 |
GRR
| Georgetown Railroad Company | 1 |
HODX
| Heart of Dixie Railway Museum | 3 |
IC
| Illinois Central | 2 |
LN
| Louisville & Nashville | 3 |
MESX
| Mears/CPG Incorporated | 2 |
MILW
| Milwaukee Road | 1 |
NW
| Norfolk & Western | 2 |
SBD
| Seaboard System | 1 |
SBVR
| South Branch Valley Rail Road | 1 |
SOU
| Southern | 2 |
SPCX
| Qwest Communications Corporation | 2 |
TSSX
| U.S. Dept. of Energy Albuquerque Operations Office | 7 |
UP
| Union Pacific Railroad Company | 10 |
USA
| USA | 3 |
USAF
| US Air Force | 5 |
USAX
| United States Army | 4 |