| 1 | KTX | ACF Industries, Inc. | added 4/1988; 1/1994; eliminated 7/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 2 | KTX | Shippers' Car Line Division, ACF Industries Inc. | added 1/1976; eliminated 7/1978; added 10/1978; 1/1980; eliminated 4/1988 | | NAKINA |
| 3 | KTX | Shippers' Car Line Division of ACF Industries, Inc. | added 4/1963; 7/1965-1/1975; eliminated 1/1976 | | NAKINA |
| 4 | KTX | Keith Ry. Equipment Co. | 4/1938-4/1961; eliminated 4/1963 | | NAKINA |
| 5 | KTX | Keith Tank Line (Keith Ry. Equipment Co.) | 8/1920-7/1937 | | NAKINA |
| 6 | KTX | Keith Tank Line (Keith Ry. Equipment Co.) | Apr-38 | | NRHS |
| 7 | KTX | Keith Ry. Equipment Co. | 1/52-4/61 | | NRHS |
| 8 | KTX | Shippers' Car Line Division of ACF Industries, Inc. | 7/65-1/75; eliminated 7/78 | | NRHS |
| 9 | KTX | Shippers' Car Line Division, ACF Industries Inc. | added 10/78; 1/80; eliminated 4/88 | | NRHS |
| 10 | KTX | ACF Industries, Inc. | added 4/88; 1/94; eliminated 7/97; 7/2000 | | NRHS |
| 11 | KTX | *KEITH RAILWAY EQUIPMENT CO. (KEITH TANK LINE) | | | PWRC |
| 12 | KTX | +SHIPPERS CAR LINE, DIV. ACF INDUSTRIES | | | PWRC |
| 13 | KTX | Keith Tank Line (ACF Industries Shippers Car Line) | | | RSRV |
| 14 | KTX | Korea Train Express | Korea Train eXpress is South Korea's high-speed rail system, operated by Korail. | ROK | TRAFFIC |
| 15 | KTXB | KELIN TRANSPORTATION LLC | | | SCAC4 |
| 16 | KTXC | KILE TRANSPORT LLC | | | SCAC4 |
| 17 | KTXH | KLEINSCHMIT TRANSPORT INC | | | SCAC4 |
| 18 | KTXI | KENTRUX INC | | | SCAC3 |
| 19 | KTXL | KROSLINES TRANSPORT & LOGISTICS | | | SCAC4 |
| 20 | KTXM | KTT TRANSPORT LLC | | | SCAC4 |
| 21 | KTXN | KERINS TRANSPORTATION | | | SCAC4 |
| 22 | KTXQ | KOTEX BROS | | | SCAC3 |
| 23 | KTXT | K T X | | | SCAC4 |
| 24 | KTXW | KELLER TRANSPORTATION INC | | | SCAC4 |
| 25 | KTXY | KEMP TRANSPORTATION SYSTEMS INC | | | SCAC4 |
