AERC
| Albany and Eastern Railroad Company | 6 |
AGYX
| Centrex Construction Products Inc (American Gypsum Company) | 1 |
AKMD
| Arkansas Midland Railroad Company | 29 |
AM
| Arkansas & Missouri | 1 |
AOK
| Arkansas-Oklahoma Railroad | 611 |
ATW
| Atlantic and Western | 338 |
BCIT
| Canadian National Railways | 15 |
BCOL
| Canadian National Railways | 370 |
BN
| Burlington Northern | 18 |
BNSF
| BNSF Railway | 610 |
BR
| Buffalo and Pittsburgh | 1 |
CAGY
| Columbus & Greenville Railway | 15 |
CBRY
| Copper Basin Railway | 49 |
CHTT
| Chicago Heights Terminal Transfer | 94 |
CLC
| Columbia and Cowlitz Railway Company | 60 |
CN
| Canadian National Railways | 580 |
CNA
| Canadian National Railways | 39 |
CNIS
| Canadian National Railways | 44 |
COER
| Crab Orchard & Egyptian | 54 |
CORP
| Central Oregon & Pacific | 19 |
CP
| Canadian Pacific Railway | 25 |
CRLE
| Coe Rail Incorporated | 57 |
CSCD
| Cascade and Columbia River Railroad Company | 4 |
CSX
| CSX Railroad | 16 |
CSXU
| CSX Transportation Incorporated | 1 |
DWC
| Canadian National Railways | 309 |
EEC
| East Erie Commercial Railroad | 3 |
FCEN
| Florida Central | 19 |
FDDM
| Fort Dodge Des Moines & Southern | 1 |
FURX
| First Union Rail | 41 |
GAEX
| General American Marks Company | 21 |
GMRC
| Green Mountain RR | 1 |
GNRR
| Georgia Northeastern | 45 |
GNWR
| Genesee and Wyoming Railroad Company | 4 |
GRYR
| Grenada Railway | 1 |
GTW
| Grand Trunk Western | 180 |
HE
| Hollis and Eastern Railroad Company | 7 |
HLSC
| Hampton Railway Incorporated | 196 |
IANR
| Iowa Northern Ry | 5 |
IBT
| International Bridge and Terminal Company | 5 |
IC
| Illinois Central | 197 |
ICG
| Illinois Central Gulf | 1 |
KCS
| Kansas City Southern | 7 |
LMIC
| Lake Michigan & Indiana Railroad | 26 |
LRS
| Laurinburg and Southern | 3 |
LW
| Louisville and Wadley Railway Company | 91 |
MDS
| Meridian Southern Railway, LLC | 1 |
MEC
| Maine Central | 1 |
MMA
| Montreal, Maine & Atlantic | 22 |
MR
| McCloud Railway Company | 17 |
MSDR
| Knoxville & Holston River Railroad | 2 |
MSRC
| Kansas City Southern | 12 |
MSV
| Mississippi and Skuna Valley Railroad Co | 10 |
NAFX
| General Electric Rail Services | 1 |
NDYX
| First Union Rail | 22 |
NOKL
| Northwestern Oklahoma | 588 |
NRLX
| CIT Group/Capital Finance, Inc | 5 |
NS
| Norfolk Southern | 327 |
ONT
| Ontario Northland Railway | 8 |
RVPR
| Riverport R.R., L.L.C. | 4 |
SERA
| Sierra Northern Railway | 8 |
SFLC
| BNSF Railway | 9 |
SGLR
| Seminole Gulf | 47 |
SLR
| St Lawrence & Atlantic | 1 |
SMW
| St Marys Railway West LLC | 48 |
SOO
| Soo Line | 448 |
SRY
| Southern Railway of British Columbia Lim | 77 |
SSAM
| Sault Ste. Marie Bridge Company (Canadia | 4 |
TKEN
| Tennken Railroad Company Incorporated | 1 |
TNER
| Texas Northeastern Division Mid-Michigan | 4 |
TOE
| Texas Oklahoma and Eastern RR Company | 8 |
TR
| Tomahawk Railway L.P. | 345 |
TSE
| Texas South-Eastern Railroad Company | 2 |
TTX
| TTX Company | 1 |
TTZX
| TTX Company-Centerbeam Flats | 2308 |
UCRY
| Utah Central | 30 |
UP
| Union Pacific Railroad Company | 183 |
WC
| Wisconsin Central | 366 |
WCRC
| Washington Central | 49 |
WCTR
| WCTU Company White City Terminal Railway | 20 |
WPRR
| Willamette and Pacific | 9 |
WRWK
| Providence & Worchester Railroad | 14 |