AERC
| Albany and Eastern Railroad Company | 8 |
AGR
| Alabama and Gulf Coast | 199 |
ALAB
| Alabama Railroad | 1 |
ALM
| Arkansas Louisiana and Mississippi Railr | 53 |
AN
| Apalachicola Northern | 11 |
AOK
| Arkansas-Oklahoma Railroad | 76 |
ASAB
| Bay Line Railroad LLC | 18 |
ATW
| Atlantic and Western | 112 |
BAEX
| Andersons | 17 |
BAYL
| Bay Line, LLC | 8 |
BKTY
| Union Pacific Railroad Company | 76 |
BM
| Boston & Maine | 8 |
BN
| Burlington Northern | 2 |
BNSF
| BNSF Railway | 26 |
CCR
| Corinth & Counce | 12 |
CIRR
| Chattahoochee Industrial Railroad | 168 |
CN
| Canadian National Railways | 2 |
CNA
| Canadian National Railways | 1 |
CNW
| Chicago & Northwestern | 32 |
COER
| Crab Orchard & Egyptian | 19 |
CP
| Canadian Pacific Railway | 20 |
CPAA
| Canadian Pacific Railway | 15 |
CSX
| CSX Railroad | 160 |
EDC
| EDC | 1 |
EEC
| East Erie Commercial Railroad | 957 |
ELS
| Escanaba and Lake Superior Railroad Comp | 1 |
FCCM
| Compania de Ferrocarriles Chiapas Mayab | 4 |
FCRD
| First Coast Railway | 5 |
FGLK
| Finger Lakes Railway | 9 |
FRR
| Falls Road Railroad Company Incorporated | 7 |
GMRC
| Green Mountain RR | 151 |
GNRR
| Georgia Northeastern | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 1 |
GTRA
| Golden Triangle Railroad | 30 |
GVSR
| Galveston Railroad L.P. | 1 |
HLMX
| Helm Financial Corporation | 19 |
HS
| H and S Railroad Company | 235 |
IANR
| Iowa Northern Ry | 7 |
IATR
| Iowa Traction Railroad Company | 1 |
KCS
| Kansas City Southern | 198 |
KRR
| Kiamichi | 5 |
KYLE
| Kyle Railroad | 3 |
LBR
| Lowville and Beaver River Railroad Compa | 43 |
LRS
| Laurinburg and Southern | 7 |
LRWN
| Little Rock & Western | 4 |
LVRC
| Lamoille Valley | 1 |
MB
| Meridian & Bigbee | 3 |
MDW
| Minnesota Dakota and Western Railway Com | 9 |
MEC
| Maine Central | 99 |
MMA
| Montreal, Maine & Atlantic | 108 |
MP
| Missouri Pacific | 7 |
MRL
| Montana Rail Link | 35 |
MSDR
| Knoxville & Holston River Railroad | 37 |
MWCX
| Midwest Railcar Corporation | 1 |
NADX
| General Electric Rail Services | 2 |
NECR
| New England Central | 2 |
NKCR
| Nebraska, Kansas & Colorado RailNet, Inc | 10 |
NOKL
| Northwestern Oklahoma | 16 |
NS
| Norfolk Southern | 302 |
PAL
| Paducah & Louisville | 1 |
PDRR
| Pee Dee River RR | 21 |
QC
| Quebec Central | 3 |
RPMX
| RPMG INC | 1 |
SGLR
| Seminole Gulf | 2 |
SIRX
| Southern Illinois Railcar Company | 11 |
SLC
| San Luis Central Railroad Company | 8 |
SLGG
| Progress Rail Services Corporation | 21 |
SLR
| St Lawrence & Atlantic | 10 |
SM
| St. Marys Railroad | 10 |
SMW
| St Marys Railway West LLC | 3 |
SNC
| Saratoga & North Creek Railway | 9 |
SOU
| Southern | 68 |
SP
| Southern Pacific | 27 |
SRN
| Sabine River & Northern | 103 |
SSAM
| Sault Ste. Marie Bridge Company (Canadia | 2 |
SSW
| St Louis Southwestern (Cotton Belt) | 9 |
TASD
| Terminal Alabama State Docks | 10 |
TKEN
| Tennken Railroad Company Incorporated | 3 |
TR
| Tomahawk Railway L.P. | 1 |
TSRD
| Twin State Railroad Company | 3 |
VCY
| Galveston Railroad, L.P. | 1 |
VR
| Valdosta Railway | 33 |
WC
| Wisconsin Central | 119 |
WCCL
| Wisconsin Central | 27 |
WCOR
| Wellsboro and Corning Railroad Company | 2 |
WLO
| Waterloo Railway Company (Illinois Central) | 2 |
WREX
| Western Railroad Equipment Company | 12 |
WRWK
| Providence & Worchester Railroad | 11 |
YB
| Youngstown Belt Railroad Company | 14 |
YKR
| York Rail | 1 |