| 1 | CWR | Beijing City International Jet Co., Ltd | Callsign: City World, Name changed to Beijing City International Business Jet Co., Ltd. | PRC | AVCODES |
| 2 | CWR | Beijing City International Business Jet Co., Ltd | Callsign: City World, Name changed from Beijing City International Jet Co., Ltd. | PRC | AVCODES |
| 3 | CWR | CWR Inc. | added 4/1998; 7/2000; eliminated 10/2002; 7/2005 | | NAKINA |
| 4 | CWR | CWRR, Inc. | added 1/1997; eliminated 4/1998 | | NAKINA |
| 5 | CWR | California Western R.R., Inc. | 10/1957-1/1994; eliminated 1/1997 | | NAKINA |
| 6 | CWR | California Western R.R. & Navigation Co. | 7/1930-7/1954 | | NAKINA |
| 7 | CWR | California Western R.R. & Navigation Co. | 4/38-1/52 | | NRHS |
| 8 | CWR | California Western R.R., Inc. | 10/57-1/94; eliminated 1/97 | | NRHS |
| 9 | CWR | CWRR, Inc. | added 1/97; eliminated 4/98 | | NRHS |
| 10 | CWR | CWR Inc. | added 4/98; 7/2000 | | NRHS |
| 11 | CWR | CALIFORNIA WESTERN RAILROAD (CWR, INC.) | | | PWRC |
| 12 | CWR | California Western Railroad (CWR) | | | RSRV |
| 13 | CWR | CWRR INC | | | SCAC4 |
| 14 | CWR | Commonwealth Railways | | AUS | TRAFFIC |
| 15 | CWRA | CRAWFORD, RAYMOND J | | | SCAC3 |
| 16 | CWRA | COMMONWEA | | | SCAC4 |
| 17 | CWRC | Central Wisconsin R.R. Co. | added 4/1981; eliminated 4/1985 | | NAKINA |
| 18 | CWRC | Central Wisconsin R.R. Co. | added 4/81; eliminated 4/85 | | NRHS |
| 19 | CWRC | CENTRAL WISCONSIN RAILROAD | | | PWRC |
| 20 | CWRC | Central Wisconsin Railroad | | | RSRV |
| 21 | CWRD | CRAWFORD TRANSPORT INC | | | SCAC3 |
| 22 | CWRD | CRAWFORD TRANSPORT INC | | | SCAC4 |
| 23 | CWRE | CLAWSON, ROBERT E INC | | | SCAC3 |
| 24 | CWRH | CROWN RELOCATIONS | | | SCAC4 |
| 25 | CWRK | COLEMAN, WALLACE R TRUCKING | | | SCAC3 |
| 26 | CWRL | Central Western Ry. Corp. | 1/1994-7/2005 | | NAKINA |
| 27 | CWRL | Central Western Ry. Corp. | 1/94-7/2000 | | NRHS |
| 28 | CWRL | CENTRAL WESTERN RAILWAY CORPORATION | | | PWRC |
| 29 | CWRL | Central Western Railway | | | RSRV |
| 30 | CWRL | CENTRAL WESTERN RAILWAY CORP | | | SCAC3 |
| 31 | CWRM | CALIFORNIA WASTE REMOVAL SYSTEMS IN | | | SCAC3 |
| 32 | CWRN | CLEARWATER TRANSPORTATION INC | | | SCAC3 |
| 33 | CWRO | ISG Cleveland Works Ry. Co. d/b/a Cleveland Works Ry. Co. | added 10/2002; 7/2005 | | NAKINA |
| 34 | CWRO | ISG CLEVELAND WORKS RAILWAY CO. D/B/A CLEVLAND WORKS RAILWAY | | | PWRC |
| 35 | CWRO | Cleveland Works Railway | | | RSRV |
| 36 | CWRO | CLEVELAND WORKS RAILWAY COMPANY | | | SCAC4 |
| 37 | CWRP | COMMERCIAL WIRE ROPE & SUPPLY CO | | | SCAC3 |
| 38 | CWRP | C W TRANSPORT | | | SCAC4 |
| 39 | CWRQ | CENTRAL WAREHOUSE AND DRAYAGE CO IN | | | SCAC3 |
| 40 | CWRQ | COMPLETE TOWING AND RECOVERY INC | | | SCAC4 |
| 41 | CWRR | California Western R.R., Inc. | Real: CWR | USA | TRAFFIC |
| 42 | CWRS | COLLIER, A B WRECKER SERVICE | | | SCAC3 |
| 43 | CWRS | CRAWFORD, ROBIN & SON WOODS CO INC | | | SCAC4 |
| 44 | CWRT | CROW RIVER TRANSPORT INC | | | SCAC3 |
| 45 | CWRX | CWR Transportation Co. | added 1/2007 | | NAKINA |
| 46 | CWRX | Crystal White Refining Co. (Harvey Crude Oil Co.) | 8/1920 | | NAKINA |
| 47 | CWRX | *HARVEY CRUDE OIL CO. (CRYSTAL WHITE REFINING CO.) | | | PWRC |
| 48 | CWRX | +CWR TRANSPORTATION CO. | | | PWRC |
| 49 | CWRX | CWR TRANSPORTATION COMPANY | | | SCAC4 |
| 50 | CWRY | Commonwealth Ry., Inc. | added 1/1990; 1/1994-7/2005 | | NAKINA |
| 51 | CWRY | Commonwealth Ry., Inc. | added 1/90; 1/94-7/2000 | | NRHS |
| 52 | CWRY | COMMONWEALTH RAILWAY, INC. | | | PWRC |
| 53 | CWRY | Commonwealth Railway | | | RSRV |
| 54 | CWRY | COMMONWEALTH RAILWAY INC | | | SCAC3 |
| 55 | CWRY | COMMONWEA | | | SCAC4 |
| 56 | CWRZ | (PW) PROVIDENCE AND WORCESTER RAILROAD CO. | | | PWRC |
| 57 | CWRZ | Providence and Worcester Railroad | | | RSRV |
| 58 | CWRZ | PROVIDENCE AND WORCESTER RAILROAD C | | | SCAC4 |
