| 1 | GCR | Cougar Leasing Limited. | Callsign: Speedcat, Suspended operations on 17 May 2003. | GB | AVCODES |
| 2 | GCR | Grand China Express Co. Ltd. | IATA: GS, IATA Prefix: 826, Name changed to Tianjin Airlines Co. Ltd | PRC | AVCODES |
| 3 | GCR | Tianjin Airlines Co. Ltd | IATA: GS, Callsign: China Dragon, IATA Prefix: 826, Name changed from Grand China Express Co. Ltd. ICAO Callsign changed to Bo Hai | PRC | AVCODES |
| 4 | GCR | Tianjin Airlines Co. Ltd | IATA: GS, Callsign: Bo Hai, IATA Prefix: 826, Name changed from Grand China Express Co. Ltd. ICAO Callsign changed from China Dragon. | PRC | AVCODES |
| 5 | GCR | GOLD COAST RAILWAY | | | PWRC |
| 6 | GCR | Great Central Railway | | GB | TRAFFIC |
| 7 | GCRAL | Transportes Hermanos Cortés, S.L | | ES | VKM |
| 8 | GCRC | The Golden Cat R.R. Corp. | added 7/1988; eliminated 4/1989; added 7/1991; 1/1994; eliminated 1/1995 | | NAKINA |
| 9 | GCRC | The Golden Cat R.R. Corp. | added 7/88; eliminated 4/89; added 7/91; 1/94; eliminated 1/95 | | NRHS |
| 10 | GCRC | GOLDEN CAT RAILROAD CORP. | | | PWRC |
| 11 | GCRC | GOLDEN CAT RAILROAD CORP, THE | | | SCAC4 |
| 12 | GCRG | GOLD COAST RACING INC & GSR TRANSPO | | | SCAC4 |
| 13 | GCRI | GOLDEN CARRIERS INC | | | SCAC4 |
| 14 | GCRM | GANASSI, CHIP RACING TEAMS INC | | | SCAC4 |
| 15 | GCRN | GILL CARRIER INC | | | SCAC4 |
| 16 | GCRR | GRAHAM COUNTY RAILROAD | | | PWRC |
| 17 | GCRR | GUERRERO CRUZ, ROLANDO | | | SCAC4 |
| 18 | GCRR | Georgia Central Ry. | Real: GC | USA | TRAFFIC |
| 19 | GCRS | GROCERS SUPPLY COMPANY INC | | | SCAC4 |
| 20 | GCRT | GENERAL CRANE AND TRUCKING SERVICE, INC | | | SCAC1 |
| 21 | GCRTA | Greater Cleveland Regional Transit Authority | | USA | TRAFFIC |
| 22 | GCRU | GARDNER CRYOGENICS | | USA | BIC |
| 23 | GCRU | Gardner Cryogenics | | | RSRV |
| 24 | GCRU | GARDNER CRYOGENICS | | | SCAC4 |
| 25 | GCRV | GIANT COLORFUL REVOLUTION LLC | | | SCAC4 |
| 26 | GCRX | Grand Canyon Ry., Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 27 | GCRX | General American Transportation Corp. | added 4/1968; 4/1970-1/1975; eliminated 7/1975; 1/1980 | | NAKINA |
| 28 | GCRX | Grand Canyon Ry., Inc. | Jul-00 | | NRHS |
| 29 | GCRX | General American Transportation Corp. | added 4/68; 4/70-1/75; eliminated 7/75; 1/80 | | NRHS |
| 30 | GCRX | *GENERAL AMERICAN TRANSPORTATION CORP. | | | PWRC |
| 31 | GCRX | +GRAND CANYON RAILWAY | | | PWRC |
| 32 | GCRX | Grand Canyon Railway | | | RSRV |
| 33 | GCRX | GRAND CANYON RAILWAY INC | | | SCAC4 |
| 34 | GCRX | Grand Canyon Railway | | USA | TRAFFIC |
| 35 | GCRY | GRAND CANYON RAILWAY | | | PWRC |
| 36 | GCRY | GULF COAST RELOCATION SYSTEMS INC | | | SCAC4 |
