ACL
| Atlantic Coast Line | 1 |
ACWR
| Aberdeen, Carolina & Western | 1 |
AR
| Aberdeen and Rockfish | 2 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
BN
| Burlington Northern | 1 |
CBQ
| Chicago Burlington & Quincy | 2 |
CGW
| Chicago Great Western | 2 |
CNW
| Chicago & Northwestern | 1 |
CO
| Chesapeake & Ohio | 2 |
CSX
| CSX Railroad | 2 |
CTR
| Clinton Terminal Railroad Company | 1 |
EJE
| Elgin Joliet and Eastern | 2 |
FCEN
| Florida Central | 1 |
GMO
| Gulf Mobile & Ohio | 2 |
GRLW
| Greenville & Western Railway Company, LLC | 2 |
IC
| Illinois Central | 9 |
ICG
| Illinois Central Gulf | 2 |
JWR
| JWR | 2 |
KWUX
| Siemens Power Corporation | 1 |
LN
| Louisville & Nashville | 2 |
MB
| Meridian & Bigbee | 1 |
MP
| Missouri Pacific | 1 |
NCRC
| Nebraska Central | 1 |
NCSL
| Nashville Chattanooga & St Louis | 1 |
NHVT
| New Hampshire and Vermont Railroad Company | 1 |
NKP
| Nickel Plate | 1 |
NP
| Northern Pacific | 1 |
NS
| Norfolk Southern | 3 |
NW
| Norfolk & Western | 4 |
SERA
| Sierra Northern Railway | 2 |
SOU
| Southern | 24 |
UP
| Union Pacific Railroad Company | 5 |
USAX
| United States Army | 2 |
WAB
| Wabash | 1 |
WM
| Western Maryland | 1 |
WSSB
| WSSB | 1 |