AKMD
| Arkansas Midland Railroad Company | 1 |
ALY
| Allegheny and Eastern Railroad Incorpora | 4 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
ATSF
| Atchison Topeka & Santa Fe | 3 |
ATW
| Atlantic and Western | 1 |
BLE
| Bessemer & Lake Erie | 2 |
BN
| Burlington Northern | 14 |
BNSF
| BNSF Railway | 3 |
BO
| Baltimore & Ohio | 39 |
BR
| Buffalo and Pittsburgh | 3 |
CBRY
| Copper Basin Railway | 13 |
CEFX
| CIT Group/Capital Finance, Inc | 10 |
CHTT
| Chicago Heights Terminal Transfer | 1 |
CN
| Canadian National Railways | 2 |
CNW
| Chicago & Northwestern | 39 |
CO
| Chesapeake & Ohio | 10 |
CR
| Conrail | 2 |
CS
| Colorado & Southern | 2 |
CSX
| CSX Railroad | 76 |
DLRX
| General Electric Rail Services | 27 |
DMM
| Dansville and Mount Morris Railroad Comp | 1 |
DRGW
| Denver & Rio Grande Western | 4 |
DTI
| Detroit Toledo & Ironton | 1 |
EJE
| Elgin Joliet and Eastern | 115 |
GBW
| Green Bay & Western | 1 |
GN
| Great Northern | 7 |
GNRR
| Georgia Northeastern | 2 |
GROX
| First Union Rail | 1 |
GVSR
| Galveston Railroad L.P. | 6 |
HS
| H and S Railroad Company | 2 |
IATR
| Iowa Traction Railroad Company | 6 |
IC
| Illinois Central | 1 |
ICG
| Illinois Central Gulf | 12 |
IHB
| Indiana Harbor Belt | 2 |
IPCX
| International Paper Company | 10 |
ITC
| Illinois Terminal Railroad | 11 |
ITLX
| General Electric Rail Services | 1 |
KCS
| Kansas City Southern | 15 |
MP
| Missouri Pacific | 2 |
MS
| Michigan Shore Railroad Incorporated | 3 |
MVRY
| Mahoning Valley Ry | 47 |
NDYX
| First Union Rail | 1 |
NKCR
| Nebraska, Kansas & Colorado RailNet, Inc | 1 |
NOKL
| Northwestern Oklahoma | 7 |
NOPB
| New Orleans Public Belt Railroad | 2 |
NRLX
| CIT Group/Capital Finance, Inc | 17 |
NS
| Norfolk Southern | 7 |
NSHR
| North Shore | 1 |
NSR
| Newburgh and South Shore Railroad Compan | 1 |
NW
| Norfolk & Western | 40 |
NYC
| New York Central | 8 |
PAL
| Paducah & Louisville | 25 |
PBR
| Patapsco and Back Rivers Railroad | 1 |
PPU
| Tazewell & Peoria Railroad | 15 |
PRSX
| Progress Rail Service | 1 |
PW
| Providence and Worcester | 1 |
RFP
| Richmond Fredericksburg & Potomac | 2 |
RSS
| Rockdale, Sandow & Southern Railroad | 1 |
SBD
| Seaboard System | 3 |
SCL
| Seaboard Coast Line | 1 |
SFS
| Santa Fe Southern | 8 |
SLGG
| Progress Rail Services Corporation | 6 |
SLSF
| Saint Louis-San Francisco | 1 |
SOU
| Southern | 35 |
SP
| Southern Pacific | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 2 |
TFM
| Kansas City Southern De Mexico | 2 |
TR
| Tomahawk Railway L.P. | 10 |
TZPR
| Tazewell & Peoria Railroad | 10 |
UP
| Union Pacific Railroad Company | 1 |
WC
| Wisconsin Central | 16 |
WRWK
| Providence & Worchester Railroad | 1 |
WTRM
| Warren and Trumbull Railroad Company | 1 |
YB
| Youngstown Belt Railroad Company | 58 |