AERC
| Albany and Eastern Railroad Company | 6 |
AGYX
| Centrex Construction Products Inc (American Gypsum Company) | 1 |
AKMD
| Arkansas Midland Railroad Company | 27 |
AOK
| Arkansas-Oklahoma Railroad | 606 |
ATW
| Atlantic and Western | 337 |
BCOL
| Canadian National Railways | 239 |
BN
| Burlington Northern | 3 |
BNSF
| BNSF Railway | 405 |
CAGY
| Columbus & Greenville Railway | 12 |
CBRY
| Copper Basin Railway | 48 |
CHTT
| Chicago Heights Terminal Transfer | 94 |
CLC
| Columbia and Cowlitz Railway Company | 60 |
CN
| Canadian National Railways | 575 |
CNA
| Canadian National Railways | 15 |
CNIS
| Canadian National Railways | 38 |
COER
| Crab Orchard & Egyptian | 52 |
CORP
| Central Oregon & Pacific | 18 |
CP
| Canadian Pacific Railway | 23 |
CRLE
| Coe Rail Incorporated | 55 |
CSCD
| Cascade and Columbia River Railroad Company | 4 |
DWC
| Canadian National Railways | 309 |
EEC
| East Erie Commercial Railroad | 3 |
FCEN
| Florida Central | 14 |
FDDM
| Fort Dodge Des Moines & Southern | 1 |
FURX
| First Union Rail | 40 |
GAEX
| General American Marks Company | 21 |
GNRR
| Georgia Northeastern | 45 |
GTW
| Grand Trunk Western | 172 |
HE
| Hollis and Eastern Railroad Company | 4 |
HLSC
| Hampton Railway Incorporated | 75 |
IANR
| Iowa Northern Ry | 6 |
IBT
| International Bridge and Terminal Company | 5 |
IC
| Illinois Central | 185 |
KCS
| Kansas City Southern | 6 |
LRS
| Laurinburg and Southern | 3 |
LW
| Louisville and Wadley Railway Company | 92 |
MDS
| Meridian Southern Railway, LLC | 1 |
MMA
| Montreal, Maine & Atlantic | 16 |
MR
| McCloud Railway Company | 13 |
MSDR
| Knoxville & Holston River Railroad | 2 |
NAFX
| General Electric Rail Services | 1 |
NDYX
| First Union Rail | 22 |
NOKL
| Northwestern Oklahoma | 560 |
NRLX
| CIT Group/Capital Finance, Inc | 5 |
NS
| Norfolk Southern | 274 |
ONT
| Ontario Northland Railway | 3 |
RVPR
| Riverport R.R., L.L.C. | 4 |
SERA
| Sierra Northern Railway | 8 |
SFLC
| BNSF Railway | 9 |
SGLR
| Seminole Gulf | 45 |
SMW
| St Marys Railway West LLC | 48 |
SOO
| Soo Line | 447 |
SRY
| Southern Railway of British Columbia Lim | 56 |
SSAM
| Sault Ste. Marie Bridge Company (Canadia | 4 |
TKEN
| Tennken Railroad Company Incorporated | 1 |
TR
| Tomahawk Railway L.P. | 343 |
TTZX
| TTX Company-Centerbeam Flats | 1832 |
UCRY
| Utah Central | 33 |
UP
| Union Pacific Railroad Company | 83 |
WC
| Wisconsin Central | 317 |
WCRC
| Washington Central | 16 |
WCTR
| WCTU Company White City Terminal Railway | 20 |
WPRR
| Willamette and Pacific | 9 |
WRWK
| Providence & Worchester Railroad | 11 |