AA
| Ann Arbor | 4 |
AC
| Algoma Central | 2 |
ATSF
| Atchison Topeka & Santa Fe | 2 |
BLE
| Bessemer & Lake Erie | 1 |
BN
| Burlington Northern | 4 |
BO
| Baltimore & Ohio | 8 |
BRC
| Belt Railway of Chicago | 3 |
CBQ
| Chicago Burlington & Quincy | 1 |
CIL
| Chicago Indianapolis & Louisville (Monon | 1 |
CIM
| Chicago And Illinois Midland | 1 |
CIND
| Central RR of Indiana | 2 |
CN
| Canadian National Railways | 3 |
CO
| Chesapeake & Ohio | 7 |
CP
| Canadian Pacific Railway | 6 |
CR
| Conrail | 2 |
CRIP
| Chicago Rock Island & Pacific | 4 |
CSL
| Chicago Short Line Railway Company | 1 |
CSS
| Chicago South Shore And South Bend | 6 |
CWP
| Chicago West Pullman & Southern | 1 |
EJE
| Elgin Joliet and Eastern | 4 |
EL
| Erie Lackawanna | 2 |
GBW
| Green Bay & Western | 2 |
GTW
| Grand Trunk Western | 6 |
IBCX
| Indiana Box Car Corporation | 1 |
IC
| Illinois Central | 4 |
IHB
| Indiana Harbor Belt | 1 |
IMRR
| Illinois Midland Railroad | 1 |
ISCX
| ISC Incorporated | 1 |
ITC
| Illinois Terminal Railroad | 1 |
LI
| Long Island Rail Road Company | 2 |
LN
| Louisville & Nashville | 1 |
LRR
| Little River Railroad | 2 |
LTSR
| LTSR | 2 |
METW
| Municipality of East Troy Wisc. | 1 |
MILW
| Milwaukee Road | 2 |
MKT
| Missouri-Kansas-Texas | 2 |
MON
| Monon Route | 3 |
MSRC
| Kansas City Southern | 1 |
NKP
| Nickel Plate | 3 |
NS
| Norfolk Southern | 2 |
NW
| Norfolk & Western | 4 |
NYC
| New York Central | 2 |
PC
| Penn Central | 3 |
RM
| RM | 1 |
SCL
| Seaboard Coast Line | 2 |
SLSF
| Saint Louis-San Francisco | 1 |
SOO
| Soo Line | 4 |
THB
| Toronto Hamilton & Buffalo | 1 |
URR
| Union Railroad | 1 |
WAB
| Wabash | 5 |
WBCR
| Wabash Central | 1 |
WM
| Western Maryland | 2 |
WWVR
| WWVR | 1 |