AOK
| Arkansas-Oklahoma Railroad | 6 |
ATSF
| Atchison Topeka & Santa Fe | 4 |
ATTX
| TTX Company - Container Flats | 3 |
BN
| Burlington Northern | 20 |
BNSF
| BNSF Railway | 59 |
BTCX
| Browner Turnout Company | 2 |
CCKX
| CCKX Incorporated | 1 |
CN
| Canadian National Railways | 1 |
CNIS
| Canadian National Railways | 1 |
CP
| Canadian Pacific Railway | 3 |
CSS
| Chicago South Shore And South Bend | 1 |
CW
| Colorado and Wyoming | 45 |
DODX
| Department Of Defense | 103 |
DRGW
| Denver & Rio Grande Western | 7 |
DSNG
| Durango & Silverton Narrow Gauge Railroa | 1 |
EGXX
| EGXX | 1 |
FEC
| Florida East Coast | 2 |
FTTX
| TTX Company | 1 |
GIMX
| General American Marks Company | 4 |
GLRX
| Georgetown Loop Railroad Incorporated | 1 |
GNWR
| Genesee and Wyoming Railroad Company | 23 |
HTTX
| TTX Company | 16 |
ICE
| Iowa Chicago and Eastern | 5 |
ITTX
| TTX Company | 25 |
JTTX
| TTX Company | 3 |
KRL
| Kasgro Rail Lines | 1 |
LMIC
| Lake Michigan & Indiana Railroad | 1 |
LTTX
| TTX Company | 2 |
MP
| Missouri Pacific | 21 |
MTTX
| TTX Company | 73 |
MVKX
| Tubular Transport Services | 2 |
NP
| Northern Pacific | 1 |
OTTX
| TTX Company | 6 |
PEYX
| Transportation Technology Services Inc | 9 |
PTNX
| PTNX | 1 |
PTTX
| TTX Company | 53 |
QTTX
| TTX Company | 10 |
QUAX
| Redstreak, LLC | 5 |
RTIX
| RTI - Railroad Services | 5 |
RTTX
| TTX Company | 1 |
SP
| Southern Pacific | 25 |
SSW
| St Louis Southwestern (Cotton Belt) | 4 |
TTCX
| TTX Company | 1 |
TTEX
| TTX Company - Articulated Flat Cars (TOFC/COFC) | 13 |
TTHX
| TTX Company - Flat Cars | 6 |
TTJX
| TTX Company-Bulkhead Flats | 2 |
TTMX
| TTX Company | 1 |
TTYX
| TTX Company | 3 |
UP
| Union Pacific Railroad Company | 53 |
UPCX
| Clean Harbors Environmental Sciences, Inc. | 1 |
VRCX
| Vortex Recycling | 1 |
VTTX
| TTX Company | 4 |
WP
| Western Pacific | 1 |
XTTX
| TTX Company | 5 |