| 1 | RF | RENFE | E | TRAFFIC | |
| 2 | RF | Railflex GmbH | DE | VKM | |
| 3 | RF&P | Richmond, Fredricksburg & Potomac R.R. Co. | 8/1920-7/1936 | NAKINA | |
| 4 | RF&P | RICHMOND, FREDERICKSBURG & POTOMAC RR (NOW CSX TRANSPORTATION) | PWRC | ||
| 5 | RFA | Raleigh Flying Service | ICAO1 | ||
| 6 | RFAA | ROBINSON FARMS | SCAC4 | ||
| 7 | RFAB | REMFILS A-2-B TRANSPORT | SCAC4 | ||
| 8 | RFAC | REFRIGERADOS ACEVEDO | SCAC4 | ||
| 9 | RFAE | U. S. DEPT. OF ENERGY ROCKY FLATS PLANT | PWRC | ||
| 10 | RFAK | REMARK FARMS | SCAC4 | ||
| 11 | RFAR | RITTER FARMS | SCAC4 | ||
| 12 | RFAV | RICKS FRAME AND COLLISION SERVICE | SCAC4 | ||
| 13 | RFB | Ringe - Fåborg Banen (Fåborgbanen) | 1882 - 1962 | DK | jernbanen.dk |
| 14 | RFB | Ringe - Fåborg Banen (Fåborgbanen) | 1882 - 1962 | DK | TRAFFIC |
| 15 | RFB | ROMPLUMB SA | RO | VKM | |
| 16 | RFBD | RALCORP FROZEN BAKERY PRODUCTS | SCAC4 | ||
| 17 | RFBG | RIFENBURG TRUCKING INC | SCAC4 | ||
| 18 | RFBI | REXIUS FOREST BY-PRODUCTS INC | SCAC4 | ||
| 19 | RFBK | RAPID FREIGHT BROKER SOLUTIONS | SCAC4 | ||
| 20 | RFBL | REFRIGERADOS BALDERAS | SCAC4 | ||
| 21 | RFBP | REXIUS FOREST BY-PRODUCTS INC | SCAC3 | ||
| 22 | RFBS | REGIONAL FLATBED SERVICE LLC | SCAC4 | ||
| 23 | RFBV | ROWE FREIGHT BROKER SERVICES LLC | SCAC4 | ||
| 24 | RFC | Aero Africa | ICAO1 | ||
| 25 | RFCA | R & F CARRIERS LLC | SCAC4 | ||
| 26 | RFCD | ROADMASTER FREIGHT COMPANIES LLC | SCAC4 | ||
| 27 | RFCF | RELIABLE FREIGHT CARRIERS | SCAC4 | ||
| 28 | RFCG | RIVERFRONT CARTAGE COMPANY OF OHIO | SCAC3 | ||
| 29 | RFCI | ROYAL FREIGHT CARRIERS INC | SCAC3 | ||
| 30 | RFCM | ROUSSEAU FARMING CO | SCAC4 | ||
| 31 | RFCN | R F C WORLD WIDE INC | SCAC3 | ||
| 32 | RFCN | ROCKLAND FUEL CARRIER | SCAC4 | ||
| 33 | RFCO | ROYAL FOODS CO INC | SCAC3 | ||
| 34 | RFCP | RECYCLED FIBERS CORP OF NJ | SCAC3 | ||
| 35 | RFCP | RUOFF & COMPANY INC | SCAC4 | ||
| 36 | RFCR | REFAC INDUSTRIAL CONTRACTORS INC | SCAC4 | ||
| 37 | RFCS | REEFER CARGO SERVICES AGENCY | SCAC3 | ||
| 38 | RFCT | R F C TRANSPORTATION SERVICE | SCAC3 | ||
| 39 | RFCT | REFURBISHED CONTAINER SYSTEMS | SCAC4 | ||
| 40 | RFCT | Rail4Chem Transalpin AG | CH | VKM | |
| 41 | RFCU | RAFFLES LEASE PTE LTD | SCAC4 | ||
| 42 | RFCV | ROCKY FREIGHT & CRANE SERVICES LTD | SCAC4 | ||
| 43 | RFCW | RFC WORLD WIDE | SCAC3 | ||
| 44 | RFCW | RLF TRUCKING INC | SCAC4 | ||
| 45 | RFCX | R&F Coal Co. | added 7/1980; eliminated 7/1991 | NAKINA | |
| 46 | RFCX | Rentco Division, Fruehauf Corp. | added 4/1967; 4/1970; eliminated 7/1972 | NAKINA | |
| 47 | RFCX | Rentco Division, Fruehauf Corp. | added 4/67; 4/70 | NRHS | |
| 48 | RFCX | R&F Coal Co. | added 7/80; eliminated 7/91 | NRHS | |
| 49 | RFCX | *RENTCO DIV., FRUEHAUF CORP. | PWRC | ||
| 50 | RFCX | *R & F COAL CO. (RETIRED 06-17-91) | PWRC | ||
| 51 | RFCX | +ROTHSAY FARMERS CO-OPERATIVE | PWRC | ||
| 52 | RFCX | R&F Coal | RSRV | ||
| 53 | RFCX | ROTHSAY FARMERS CO-OPERATIVE | SCAC4 | ||
| 54 | RFCY | RUTLAND FUEL CO | SCAC4 | ||
| 55 | RFD | Aerotransportes Rafilher | ICAO1 | ||
| 56 | RFD | Railfreight Distribution | GB | TRAFFIC | |
| 57 | RFDI | RELIABLE FREIGHT DISTRIBUTORS INC | SCAC4 | ||
| 58 | RFDL | RAFTER T LIMITED | SCAC4 | ||
| 59 | RFDN | RAEFORD TRUCKING | SCAC4 | ||
| 60 | RFDW | RANCHO FLORES DEL OESTE - FLORAWEST | SCAC4 | ||
| 61 | RFEI | RED FEATHER EXPRESS INC | SCAC4 | ||
| 62 | RFEN | R F ENTERPRISES | SCAC4 | ||
| 63 | RFEO | REYNA, FERNANDO | SCAC4 | ||
| 64 | RFEQ | RICE FARM EQUIPMENT | SCAC4 | ||
| 65 | RFER | REEFER XPRESS | SCAC4 | ||
| 66 | RFES | REFRIGERATED EXPRESS SERVICE | SCAC3 | ||
| 67 | RFES | REFRIGERATED EXPRESS SERVICE | SCAC4 | ||
| 68 | RFET | REEFER TERMINALS INC | SCAC3 | ||
| 69 | RFEZ | (REAZ) RETIRED 04-06-93 ATP (ACI 2348) | PWRC | ||
| 70 | RFF | Russian Federation Air Force | ICAO1 | ||
| 71 | RFFA | ROBERTSON FAST FREIGHT | SCAC4 | ||
| 72 | RFFI | ROSS FAST FREIGHT | SCAC3 | ||
| 73 | RFFL | RONS FAMILY FUEL | SCAC4 | ||
| 74 | RFFN | RIFFLINE INC | SCAC3 | ||
| 75 | RFFN | RAINFOREST FLORA INC | SCAC4 | ||
| 76 | RFFO | ROCCO FARM FOODS INC | SCAC3 | ||
| 77 | RFFQ | RUFFOLO, J & SONS | SCAC3 | ||
| 78 | RFFR | RAYMOUR & FLANIGAN FURNITURE | SCAC4 | ||
| 79 | RFFS | RIFF SHIPPING CORP PIRAEUS GREECE | SCAC3 | ||
| 80 | RFFSA | Rede Ferrovária Federal SA | BR | TRAFFIC | |
| 81 | RFFT | R F FREIGHT LINES INC | SCAC3 | ||
| 82 | RFFW | RENFREIGHT FORWARDING S A | SCAC3 | ||
| 83 | RFGA | RFG TRANSPORTATION | SCAC4 | ||
| 84 | RFGD | REFRIGERATED TRUCKING SERVICE, INC | SCAC3 | ||
| 85 | RFGD | REFRIGERATED TRUCKING SERVICE INC | SCAC4 | ||
| 86 | RFGH | RAIL FREIGHT TRANS CO | SCAC3 | ||
| 87 | RFGH | RAIL FREIGHT TRANSPORTATION INC | SCAC4 | ||
| 88 | RFGI | ROYAL FREIGHT INC | SCAC3 | ||
| 89 | RFGI | RAFAGAS DEL PACIFICO | SCAC4 | ||
| 90 | RFGM | REFRIGERADOS SDL | SCAC4 | ||
| 91 | RFGP | R F G | SCAC4 | ||
| 92 | RFGT | R F G TRUCKING CO | SCAC3 | ||
| 93 | RFGT | R F G TRANSPORT INC | SCAC4 | ||
| 94 | RFHS | REINDEER FREIGHT SYSTEM | SCAC3 | ||
| 95 | RFHS | REFRIGERADOS HERMANOS VELASCO ALCAR | SCAC4 | ||
| 96 | RFI | National Air Traffic Services | ICAO1 | ||
| 97 | RFI | Rete Ferroviaria Italiana | The owner of the FS railway network. | I | TRAFFIC |
| 98 | RFI | Rete Ferroviaria Italiana | IT | VKM | |
| 99 | RFII | RAJ FREIGHTLINES INC | SCAC4 | ||
| 100 | RFIP | RAFFIELD FISHERIES INC | SCAC4 |