BM
| Boston & Maine | 5 |
BTCX
| Browner Turnout Company | 4 |
DRGW
| Denver & Rio Grande Western | 1 |
FTSX
| Fairmont Tamper | 2 |
ITTX
| TTX Company | 1 |
KRL
| Kasgro Rail Lines | 11 |
MEC
| Maine Central | 1 |
PTTX
| TTX Company | 1 |
QTTX
| TTX Company | 2 |
RBBX
| Ringling Bros. and Barnum and Bailey | 27 |
RTTX
| TTX Company | 1 |
TTX
| TTX Company | 1 |
TTXX
| TTX Company | 1 |
XTTX
| TTX Company | 1 |