ALS
| Alton & Southern Railway | 66 |
AOK
| Arkansas-Oklahoma Railroad | 1 |
ASPL
| ASPL | 3 |
ATS
| ATS | 1 |
ATSF
| Atchison Topeka & Santa Fe | 7 |
BN
| Burlington Northern | 53 |
BNO
| Burlington Northern and Santa Fe Railway Company | 1 |
BNSF
| BNSF Railway | 99 |
CHEM
| CHEM | 1 |
CN
| Canadian National Railways | 6 |
CNW
| Chicago & Northwestern | 1 |
CP
| Canadian Pacific Railway | 2 |
CR
| Conrail | 2 |
CSX
| CSX Railroad | 11 |
CW
| Colorado and Wyoming | 1 |
DBIX
| DBIX | 3 |
DMVW
| Dakota Missouri Valley and Western Railr | 1 |
DRGW
| Denver & Rio Grande Western | 1 |
DRS
| DRS | 1 |
EE
| Ellis and Eastern Company | 1 |
GN
| Great Northern | 1 |
GREX
| Georgetown Rail Equipment Company | 2 |
GTAS
| GTAS | 1 |
HOLX
| HOLX | 1 |
HRZ
| HRZ | 2 |
HTT
| Harsco Track Technologies | 13 |
HZGX
| Herzog Contracting Corporation | 8 |
IC
| Illinois Central | 5 |
ICE
| Iowa Chicago and Eastern | 1 |
KCS
| Kansas City Southern | 17 |
KJRY
| Keokuk Junction | 1 |
LIRC
| Louisville & Indiana | 1 |
LMIX
| Loram Maintenance of Way Inc. | 7 |
MP
| Missouri Pacific | 10 |
MQT
| Marquette Rail | 1 |
MRL
| Montana Rail Link | 8 |
NS
| Norfolk Southern | 41 |
NW
| Norfolk & Western | 3 |
ONWX
| ONWX | 1 |
PTS
| PTS | 1 |
QRSX
| Quality Railway Services and Supply Company | 1 |
RJCR
| RJ Corman | 1 |
RJCX
| RJCX | 6 |
RKCX
| Knox Kershaw Incorporated | 1 |
RMSX
| Pandrol Jackson Incorporated | 4 |
RRC
| Respondek Railroad Corporation | 2 |
SOU
| Southern | 3 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 15 |
SRS
| Sperry Rail Service | 2 |
TPW
| Toledo Peoria & Western | 1 |
TRRA
| Terminal RR of St Louis | 20 |
UP
| Union Pacific Railroad Company | 198 |