ATS
| ATS | 1 |
ATSF
| Atchison Topeka & Santa Fe | 4 |
BC
| BARRE & CHELSEA RAILROAD | 2 |
BNSF
| BNSF Railway | 47 |
BR
| Buffalo and Pittsburgh | 1 |
CBQ
| Chicago Burlington & Quincy | 1 |
CNW
| Chicago & Northwestern | 5 |
CNWX
| Canadian Wheat Board | 2 |
DC
| Delray Connecting Railroad Company | 1 |
DRGW
| Denver & Rio Grande Western | 3 |
EC
| EC | 3 |
GREX
| Georgetown Rail Equipment Company | 6 |
HERZ
| HERZ | 1 |
HRZ
| HRZ | 2 |
HZGX
| Herzog Contracting Corporation | 18 |
MKT
| Missouri-Kansas-Texas | 1 |
MP
| Missouri Pacific | 10 |
MW
| MW | 1 |
OHIO
| OHIO | 1 |
RELA
| RELA | 1 |
RMSX
| Pandrol Jackson Incorporated | 4 |
SDAG
| SDAG | 1 |
SP
| Southern Pacific | 1 |
SPMW
| Southern Pacific Maintenance of Way | 4 |
SPSX
| Progress Rail Services Corp | 14 |
SRS
| Sperry Rail Service | 1 |
TMT
| Trailer Marine Transport Corporation | 1 |
UP
| Union Pacific Railroad Company | 38 |