| 6901 | RPMW | READS-PERKI | SCAC4 | ||
| 6902 | RPMX | RPMG, INC. | PWRC | ||
| 6903 | RPMX | RPMG INC | SCAC4 | ||
| 6904 | RPMY | R P M TRUCKING INC | SCAC3 | ||
| 6905 | RPMZ | (REAZ) TRANSAMERICA LEASING, INC. | PWRC | ||
| 6906 | RPMZ | TAL International | RSRV | ||
| 6907 | RPND | RAPID PARCEL POST AND DELIVERY | SCAC3 | ||
| 6908 | RPNJ | R I PAGE & JONES INC | SCAC3 | ||
| 6909 | RPNR | ROOP & ROOP TRUCKING | SCAC3 | ||
| 6910 | RPNR | ROUNDUP PROPANE CO | SCAC4 | ||
| 6911 | RPNS | ROARK, PAUL & SONS | SCAC3 | ||
| 6912 | RPNX | Rhodia Inc. (RPNX) | added 4/2008; added 7/2009 | NAKINA | |
| 6913 | RPNX | RHODIA, INC. | PWRC | ||
| 6914 | RPNX | RHODIA INC | SCAC4 | ||
| 6915 | RPOH | RPTS INC | SCAC3 | ||
| 6916 | RPOH | RPTS INC | SCAC4 | ||
| 6917 | RPOOL | RailPool GmbH | D | TRAFFIC | |
| 6918 | RPOOL | Railpool GmbH | DE | VKM | |
| 6919 | RPOP | RAMP OPERATION INC | SCAC3 | ||
| 6920 | RPOX | Refinery Products Co., Division of QuVoe Chemical Industries, Inc. | added 4/1967; 4/1970; eliminated 7/1970 | NAKINA | |
| 6921 | RPOX | Refinery Products Co. | added 10/1962; 7/1965-10/1966; eliminated 4/1967 | NAKINA | |
| 6922 | RPOX | Refinery Products Co. | 7/65-10/66; eliminated 4/67 | NRHS | |
| 6923 | RPOX | Refinery Products Co., Division of QuVoe Chemical Industries, Inc. | added 4/67; 4/70; eliminated 7/70 | NRHS | |
| 6924 | RPOX | REFINERY PRODUCTS CO., DIV. QUVOE CHEMICAL INDUSTRIES, INC. | PWRC | ||
| 6925 | RPOX | REFINERY PRODUCTS CO | SCAC3 | ||
| 6926 | RPPC | RELIANCE SHIPPING CORP MONROVIA LIB | SCAC3 | ||
| 6927 | RPPI | READY PAC PRODUCE INC | SCAC4 | ||
| 6928 | RPPQ | RAPID PARCEL DELIVERY CO | SCAC3 | ||
| 6929 | RPPT | RAPP TRANSPORT INC | SCAC3 | ||
| 6930 | RPPX | Hexion Specialty Chemicals, Inc. | added 7/2007 | NAKINA | |
| 6931 | RPPX | Resolution Performance Products LLC | added 1/2003; 7/2005; eliminated 7/2007 | NAKINA | |
| 6932 | RPPX | *RESOLUTION PERFORMANCE PRODUCTS LLC | PWRC | ||
| 6933 | RPPX | +HEXION SPECIALTY CHEMICALS, INC. | PWRC | ||
| 6934 | RPPX | Resolution Performance Products | RSRV | ||
| 6935 | RPPX | RESOLUTION PERFORMANCE PRODUCTS LLC | SCAC4 | ||
| 6936 | RPQH | RAFTER P QUARTER HORSE RANCH | SCAC4 | ||
| 6937 | RPQT | R & P TRUCKING | SCAC4 | ||
| 6938 | RPR | RailParty Rheinland GmbH | DE | VKM | |
| 6939 | RPRC | Richmond Pacific R.R. Corp. | 7/2005 | NAKINA | |
| 6940 | RPRC | RICHMOND PACIFIC RAILROAD CORP. | PWRC | ||
| 6941 | RPRC | Richmond Pacific Railroad | RSRV | ||
| 6942 | RPRC | RAPID RUN INC | SCAC3 | ||
| 6943 | RPRC | RICHMOND PACIFIC RAILROAD CORPORATI | SCAC4 | ||
| 6944 | RPRC | Richmond Pacific Railroad Corporation | USA | TRAFFIC | |
| 6945 | RPRD | ROTH PRODUCTS INC | SCAC3 | ||
| 6946 | RPRD | RAMOS PICASSO, ROLANDO | SCAC4 | ||
| 6947 | RPRE | RAPID RUNNER EXPRESS | SCAC3 | ||
| 6948 | RPRE | RPR ENVIRONMENTAL | SCAC4 | ||
| 6949 | RPRI | RAPID RADIAL TRANSPORT INC | SCAC3 | ||
| 6950 | RPRK | RAILCAR-PARKER INC. | PWRC | ||
| 6951 | RPRL | R.P.R. TRANSPORT LTEE | SCAC3 | ||
| 6952 | RPRN | R P R TRUCKING INC | SCAC3 | ||
| 6953 | RPRO | RailPro | NL | TRAFFIC | |
| 6954 | RPRR | RIPP, ROBERT A | SCAC3 | ||
| 6955 | RPRS | Railsystems RP GmbH | DE | VKM | |
| 6956 | RPRT | RUPERT OIL COMPANY INC | SCAC4 | ||
| 6957 | RPRU | RHONE-PROGIL | SCAC3 | ||
| 6958 | RPRV | RN PRODUCE | SCAC4 | ||
| 6959 | RPRX | North American Car Corp. | added 7/1955; eliminated 10/1957; added 1/1958; 4/1961-1/1980; eliminated 7/1982 | NAKINA | |
| 6960 | RPRX | Mather Stock Car Co. | eliminated 7/1955 | NAKINA | |
| 6961 | RPRX | Rath Packing Co. (Mather Stock Car Co.) | 4/1947-7/1954 | NAKINA | |
| 6962 | RPRX | Mather Stock Car Co. | 1/1946 | NAKINA | |
| 6963 | RPRX | Rath Packing Co. (Mather Stock Car Co.) | 1/1941-1/1945 | NAKINA | |
| 6964 | RPRX | Rath Packing Co. | 7/1937-4/1938 | NAKINA | |
| 6965 | RPRX | The Rath Packing Co. | 8/1920-7/1935 | NAKINA | |
| 6966 | RPRX | Rath Packing Co. (Mather Stock Car Co.) | 4/38-1/52 | NRHS | |
| 6967 | RPRX | Mather Stock Car Co. | eliminated 7/55 | NRHS | |
| 6968 | RPRX | North American Car Corp. | added 7/55; eliminated 10/57; added 1/58; 4/61-1/80; eliminated 7/82 | NRHS | |
| 6969 | RPRX | RATH PACKING CO. (NACCO [MATHER STOCK CAR CO.]) | PWRC | ||
| 6970 | RPRX | Railpower Hybrid Technologies Corp | RSRV | ||
| 6971 | RPRX | RAILPOWER TECHNOLOGIES INC | SCAC4 | ||
| 6972 | RPRX | Rail Power Technologies | USA | TRAFFIC | |
| 6973 | RPS | Global Air Charter | ICAO1 | ||
| 6974 | RPS | RAILROAD PUBLICATION SERVICES | PWRC | ||
| 6975 | RPS | ROADWAY PACKAGE SYSTEM, INC. | PWRC | ||
| 6976 | RPS | RAILROAD PUBLICATION SERVICES | SCAC4 | ||
| 6977 | RPS | Rail Professionals Stütz GmbH | AT | VKM | |
| 6978 | RPSA | R P S ASSOCIATES | SCAC3 | ||
| 6979 | RPSA | RAPTIS, ANDREW G ENTERPRISE | SCAC4 | ||
| 6980 | RPSB | RPS INC (MULTICODE LABEL DIVISION) | SCAC4 | ||
| 6981 | RPSC | RPS INC (RETAIL LABEL DIVISION) | SCAC4 | ||
| 6982 | RPSE | REPSEL TRUCKING INC | SCAC3 | ||
| 6983 | RPSE | RPM & ASSOCIATES INC | SCAC4 | ||
| 6984 | RPSF | ROCKY POINTE SEAFOOD | SCAC4 | ||
| 6985 | RPSG | RIMPACIFIC SHIPPING UK LTD LONDON | SCAC3 | ||
| 6986 | RPSI | ROADWAY PACKAGE SYSTEM, INC | SCAC3 | ||
| 6987 | RPSI | RPS INC | SCAC4 | ||
| 6988 | RPSI | Railway Preservation Society of Ireland | IE | VKM | |
| 6989 | RPSK | RPS TRUCKING CO | SCAC4 | ||
| 6990 | RPSL | RELIANCE PACIFIC SHIPPING LTD | SCAC3 | ||
| 6991 | RPSM | RAPPS MOVING AND STORAGE INC | SCAC3 | ||
| 6992 | RPSO | REPLOGLE STORAGE COMPANY | SCAC3 | ||
| 6993 | RPSO | RHINO PRINT SOLUTIONS | SCAC4 | ||
| 6994 | RPSP | REPSOL PETROLEO S A | SCAC3 | ||
| 6995 | RPSS | ROYAL PAPER STOCK CO INC | SCAC4 | ||
| 6996 | RPST | RESPESS TRUCKING INC | SCAC3 | ||
| 6997 | RPSV | RAPID SERV INC | SCAC3 | ||
| 6998 | RPSX | *RAIL PASSENGER SERVICE, INC. | PWRC | ||
| 6999 | RPSX | +SIERRA MADRE EXPRESS, INC. | PWRC | ||
| 7000 | RPSX | SIERRA MADRE EXPRESS INC | SCAC4 |