| 1801 | RCRT | REYES, C R TRANSPORTATION INC | | | SCAC4 |
| 1802 | RCRV | RIVER CITY RUSH DELIVERY INC | | | SCAC4 |
| 1803 | RCRX | Reagent Chemical & Research, Inc. | added 11/1973; 1/1975-7/2005 | | NAKINA |
| 1804 | RCRX | Reagent Chemical & Research, Inc. | added 11/73; 1/75-7/2000 | | NRHS |
| 1805 | RCRX | REAGENT CHEMICAL & RESEARCH INC | | | PWRC |
| 1806 | RCRX | Reagent Chemical and Research | | | RSRV |
| 1807 | RCRX | REAGENT CHEMICAL & RESEARCH INC | | | SCAC4 |
| 1808 | RCRX | Reagent Chemical & Research, Inc. | | USA | TRAFFIC |
| 1809 | RCRY | Raritan Central Ry. LLC | 7/2005 | | NAKINA |
| 1810 | RCRY | RARITAN CENTRAL RWY. LLC | | | PWRC |
| 1811 | RCRY | Raritan Central Railway | | | RSRV |
| 1812 | RCRY | RARITAN CENTRAL RAILWAY LLC | | | SCAC4 |
| 1813 | RCRZ | (CSXT)RETIRED 04-06-93 ATP (ACI 2342) | | | PWRC |
| 1814 | RCS | Air Consul, S.A. | Callsign: Aeroconsul, | GQ | AVCODES |
| 1815 | RCSA | RENOWN CO., S.A | | | SCAC3 |
| 1816 | RCSA | RCS TRUCKING & FREIGHT INC | | | SCAC4 |
| 1817 | RCSB | R C COLA-7-UP BOTTLING CO | | | SCAC3 |
| 1818 | RCSC | RITE CONTAINER SERVICE CORP | | | SCAC3 |
| 1819 | RCSC | RCS LOGISTICS INC | | | SCAC4 |
| 1820 | RCSE | RETREAT COVE STUDIO | | | SCAC4 |
| 1821 | RCSF | RCS FARMS | | | SCAC3 |
| 1822 | RCSF | R C SEAFOOD LTD | | | SCAC4 |
| 1823 | RCSG | ROSENBERGERS COLD TRANSPORT INC | | | SCAC3 |
| 1824 | RCSG | RICO SILVA, GONZALO | | | SCAC4 |
| 1825 | RCSH | REED CONTRACTING SERVICES INC | | | SCAC4 |
| 1826 | RCSI | R C FREIGHTWAYS INC | | | SCAC3 |
| 1827 | RCSI | RESEARCH CASTING INTERNATIONAL | | | SCAC4 |
| 1828 | RCSK | RICE, STEVEN TRUCKING | | | SCAC3 |
| 1829 | RCSL | RCS LIMOUSINE SERVICE INC | | | SCAC3 |
| 1830 | RCSL | RCS TRANSPORTATION LLC | | | SCAC4 |
| 1831 | RCSN | R C & SONS INC | | | SCAC3 |
| 1832 | RCSN | RC TRANSFER INC | | | SCAC4 |
| 1833 | RCSO | RICSONS INC | | | SCAC3 |
| 1834 | RCSO | R C S OIL INC | | | SCAC4 |
| 1835 | RCSQ | RCS VAN & STORAGE | | | SCAC3 |
| 1836 | RCSQ | RIVERBANK CARGO SOLUTIONS LLC | | | SCAC4 |
| 1837 | RCSR | ROCKS CRANE SERVICE INC | | | SCAC3 |
| 1838 | RCST | RCS TRUCKING & LEASING CORP | | | SCAC4 |
| 1839 | RCSU | RAIL CONTAINER SERVICES, INC. | | | SCAC3 |
| 1840 | RCSV | RAIL CONTAINER SERVICES INC | | | SCAC3 |
| 1841 | RCSX | Railroad Solutions, LLC | 7/2005 (not listed) | | NAKINA |
| 1842 | RCSX | Railroad Car Service Corp. | added 4/1985; eliminated 1/1987 | | NAKINA |
| 1843 | RCSX | North American Car Corp. | added 7/1960; 4/1961-4/1970; eliminated 10/1974 | | NAKINA |
| 1844 | RCSX | Railway Tank Car Service, Inc. | 1/1946 (not listed); 4/1947-10/1957; eliminated 7/1960 | | NAKINA |
| 1845 | RCSX | Railway Tank Car Service, Inc. | 1/52-10/57; eliminated 7/60 | | NRHS |
| 1846 | RCSX | North American Car Corp. | added 7/60; 4/61-4/70; eliminated 10/74 | | NRHS |
| 1847 | RCSX | Railroad Car Service Corp. | added 4/85; eliminated 1/87 | | NRHS |
| 1848 | RCSX | *NORTH AMERICAN CAR CORP. [RAILWAY TANK CAR SERVICE, INC] | | | PWRC |
| 1849 | RCSX | *RAILROAD CAR SERVICE CORP. | | | PWRC |
| 1850 | RCSX | +RAILCAR SOLUTIONS, LLC | | | PWRC |
| 1851 | RCSX | Red-Corn Scrap Metals | | | RSRV |
| 1852 | RCSX | RAILCAR SOLUTIONS LLC | | | SCAC4 |
| 1853 | RCSY | RELIABLE CARTAGE SERVICES | | | SCAC4 |
| 1854 | RCSZ | RAIL CONTAINER SERVICES, INC. | | | PWRC |
| 1855 | RCSZ | Rail Container Services | | | RSRV |
| 1856 | RCSZ | RAIL CONTAINER SERVICES INC | | | SCAC4 |
| 1857 | RCT | Ryan Air Service, Inc. | Callsign: Arctic Transport, | USA | AVCODES |
| 1858 | RCT | Rectimo Air Transport | | F | AVCODES |
| 1859 | RCT | Skyview Airways Co., Ltd. d/b/a Skyview | IATA: RK, Callsign: Green Sky, Founded in 2012. | T | AVCODES |
| 1860 | RCT | Ryan Air Service | | | ICAO1 |
| 1861 | RCT | Railcare Tåg AB | 2008 - | S | svenska-lok.se |
| 1862 | RCT | Railcare Tåg AB | 2008 | S | TRAFFIC |
| 1863 | RCT | Railcare Tåg AB | | SE | VKM |
| 1864 | RCTB | RIVER CITY TOURS | | | SCAC3 |
| 1865 | RCTC | RICO TILE COMPANY INC | | | SCAC3 |
| 1866 | RCTC | RICHTER TRUCKING | | | SCAC4 |
| 1867 | RCTD | ROCKING C TRUCK LINES INC | | | SCAC3 |
| 1868 | RCTD | ROCKING C TRUCK LINES INC | | | SCAC4 |
| 1869 | RCTF | R C TRANSFER INC | | | SCAC3 |
| 1870 | RCTF | RICO, CHANO TRUCKING INC | | | SCAC4 |
| 1871 | RCTG | R C TRUCKING | | | SCAC3 |
| 1872 | RCTG | ROYAL CANADIAN TRUCKING INC | | | SCAC4 |
| 1873 | RCTH | ROBINSON, C P TRUCKING & HOT SHOT S | | | SCAC3 |
| 1874 | RCTI | RICHERT, C L TRUCKING INC | | | SCAC3 |
| 1875 | RCTK | RICHARDS TRUCKING LINE | | | SCAC3 |
| 1876 | RCTK | REMORQUAGE COATICOOK | | | SCAC4 |
| 1877 | RCTL | RUSSMAN, CHARLIE TRUCKING INC | | | SCAC4 |
| 1878 | RCTM | R & C TRUCKS INC | | | SCAC3 |
| 1879 | RCTN | RICKY T INC | | | SCAC4 |
| 1880 | RCTO | RICHARDS TRUCKING | | | SCAC3 |
| 1881 | RCTO | ROCA ETERNA TRANSPORTATION | | | SCAC4 |
| 1882 | RCTP | RICH TRANSPORT INC | | | SCAC3 |
| 1883 | RCTP | R & C TRANSPORTATION LLC | | | SCAC4 |
| 1884 | RCTQ | RICHTER TRANSFER COMPANY, THE | | | SCAC3 |
| 1885 | RCTQ | R C TRANSPORTATION INC | | | SCAC4 |
| 1886 | RCTS | R C TRANS | | | SCAC3 |
| 1887 | RCTT | RICKERT TRUCKING | | | SCAC3 |
| 1888 | RCTT | REACT TOOL & MOLD INC | | | SCAC4 |
| 1889 | RCTU | DEFENCE CONTAINER MANAGEMENT SERVICE | | GB | BIC |
| 1890 | RCTU | DEFENCE CONTAINER MANAGEMENT SERVIC | | | SCAC4 |
| 1891 | RCTV | R.C. TRANSPORT, INC | | | SCAC3 |
| 1892 | RCTX | Railwest Canada, Inc. | added 4/2001; 7/2005; eliminated 4/2009; eliminated 10/2009 | | NAKINA |
| 1893 | RCTX | RAILWEST CANADA, INC. | | | PWRC |
| 1894 | RCTX | Railwest Canada | | | RSRV |
| 1895 | RCTX | RAILWEST CANADA INC | | | SCAC4 |
| 1896 | RCTY | RCT | | | SCAC4 |
| 1897 | RCTZ | (REAZ) RETIRED 04-06-93 ATP (ACI 2540) | | | PWRC |
| 1898 | RCU | Atlantic, S.L. | Callsign: Air Courier, | E | AVCODES |
| 1899 | RCU | Atlantic S.L. | | | ICAO1 |
| 1900 | RCUC | R & C TRUCKING INC | | | SCAC4 |
