| 1 | RPR | Aeroservicios Paraguana C.A. Aeropar | Callsign: Aeropar, | YV | AVCODES |
| 2 | RPR | Administracion Profesional de Aeronaves, S.A. de C.V. | Callsign: Aeroprofesional, | MEX | AVCODES |
| 3 | RPR | RailParty Rheinland GmbH | | DE | VKM |
| 4 | RPRC | Richmond Pacific R.R. Corp. | 7/2005 | | NAKINA |
| 5 | RPRC | RICHMOND PACIFIC RAILROAD CORP. | | | PWRC |
| 6 | RPRC | Richmond Pacific Railroad | | | RSRV |
| 7 | RPRC | RAPID RUN INC | | | SCAC3 |
| 8 | RPRC | RICHMOND PACIFIC RAILROAD CORPORATI | | | SCAC4 |
| 9 | RPRC | Richmond Pacific Railroad Corporation | | USA | TRAFFIC |
| 10 | RPRD | ROTH PRODUCTS INC | | | SCAC3 |
| 11 | RPRD | RAMOS PICASSO, ROLANDO | | | SCAC4 |
| 12 | RPRE | RAPID RUNNER EXPRESS | | | SCAC3 |
| 13 | RPRE | RPR ENVIRONMENTAL | | | SCAC4 |
| 14 | RPRI | RAPID RADIAL TRANSPORT INC | | | SCAC3 |
| 15 | RPRK | RAILCAR-PARKER INC. | | | PWRC |
| 16 | RPRL | R.P.R. TRANSPORT LTEE | | | SCAC3 |
| 17 | RPRN | R P R TRUCKING INC | | | SCAC3 |
| 18 | RPRO | RailPro | | NL | TRAFFIC |
| 19 | RPRR | RIPP, ROBERT A | | | SCAC3 |
| 20 | RPRS | Railsystems RP GmbH | | DE | VKM |
| 21 | RPRT | RUPERT OIL COMPANY INC | | | SCAC4 |
| 22 | RPRU | RHONE-PROGIL | | | SCAC3 |
| 23 | RPRV | RN PRODUCE | | | SCAC4 |
| 24 | RPRX | North American Car Corp. | added 7/1955; eliminated 10/1957; added 1/1958; 4/1961-1/1980; eliminated 7/1982 | | NAKINA |
| 25 | RPRX | Mather Stock Car Co. | eliminated 7/1955 | | NAKINA |
| 26 | RPRX | Rath Packing Co. (Mather Stock Car Co.) | 4/1947-7/1954 | | NAKINA |
| 27 | RPRX | Mather Stock Car Co. | 1/1946 | | NAKINA |
| 28 | RPRX | Rath Packing Co. (Mather Stock Car Co.) | 1/1941-1/1945 | | NAKINA |
| 29 | RPRX | Rath Packing Co. | 7/1937-4/1938 | | NAKINA |
| 30 | RPRX | The Rath Packing Co. | 8/1920-7/1935 | | NAKINA |
| 31 | RPRX | Rath Packing Co. (Mather Stock Car Co.) | 4/38-1/52 | | NRHS |
| 32 | RPRX | Mather Stock Car Co. | eliminated 7/55 | | NRHS |
| 33 | RPRX | North American Car Corp. | added 7/55; eliminated 10/57; added 1/58; 4/61-1/80; eliminated 7/82 | | NRHS |
| 34 | RPRX | RATH PACKING CO. (NACCO [MATHER STOCK CAR CO.]) | | | PWRC |
| 35 | RPRX | Railpower Hybrid Technologies Corp | | | RSRV |
| 36 | RPRX | RAILPOWER TECHNOLOGIES INC | | | SCAC4 |
| 37 | RPRX | Rail Power Technologies | | USA | TRAFFIC |
