AAR
| Association of American Railroads | 7 |
ATSF
| Atchison Topeka & Santa Fe | 1 |
BN
| Burlington Northern | 2 |
BO
| Baltimore & Ohio | 2 |
CBQ
| Chicago Burlington & Quincy | 1 |
CEI
| Chicago & Eastern Illinois | 1 |
CO
| Chesapeake & Ohio | 1 |
CP
| Canadian Pacific Railway | 2 |
CR
| Conrail | 2 |
CSS
| Chicago South Shore And South Bend | 4 |
CWI
| Chicago and Western Indiana | 1 |
DCCX
| McDonnell Douglas Corporation | 1 |
GTW
| Grand Trunk Western | 2 |
IHB
| Indiana Harbor Belt | 1 |
INLX
| Incoal Company | 8 |
ISCX
| ISC Incorporated | 2 |
MILW
| Milwaukee Road | 1 |
MON
| Monon Route | 1 |
MP
| Missouri Pacific | 1 |
NKP
| Nickel Plate | 1 |
NYC
| New York Central | 1 |
WAB
| Wabash | 1 |