AAR
| Association of American Railroads | 1 |
ACL
| Atlantic Coast Line | 1 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
CSX
| CSX Railroad | 1 |
DRGW
| Denver & Rio Grande Western | 2 |
FEC
| Florida East Coast | 1 |
GPEX
| General American Pfaudler | 1 |
INLX
| Incoal Company | 18 |
MP
| Missouri Pacific | 1 |
MSRW
| Mississippian Railway Cooperative Incorporated | 1 |
NCSL
| Nashville Chattanooga & St Louis | 1 |
NW
| Norfolk & Western | 1 |
SCL
| Seaboard Coast Line | 1 |
UPP
| Union Pacific Passenger | 2 |