| 6701 | ROYJ | ROYAL ELECTRIC SUPPLY COMPANY | SCAC4 | ||
| 6702 | ROYK | ROY, MARK | SCAC4 | ||
| 6703 | ROYL | ROYAL TRANSPORTATION LIMITED | SCAC3 | ||
| 6704 | ROYL | ROYAL TRANSPORTATION LIMITED | SCAC4 | ||
| 6705 | ROYM | ROYAL MARITIME CORPORATION | SCAC4 | ||
| 6706 | ROYN | ROYAL MESSENGER SERVICE | SCAC3 | ||
| 6707 | ROYN | ROY, MARTIN TRANSPORT | SCAC4 | ||
| 6708 | ROYP | ROYAL TRANSPORT INC | SCAC3 | ||
| 6709 | ROYP | ROYAL TRANSPORT INC | SCAC4 | ||
| 6710 | ROYQ | ROYAL TRUCKING | SCAC4 | ||
| 6711 | ROYR | ROY BROS, INC | SCAC3 | ||
| 6712 | ROYR | ROY BROS INC | SCAC4 | ||
| 6713 | ROYS | ROYS TRANSFER SERVICE | SCAC3 | ||
| 6714 | ROYT | ROYSTER TRUCKING INC | SCAC3 | ||
| 6715 | ROYT | ROYSTER TRUCKING INC | SCAC4 | ||
| 6716 | ROYU | ROYAL NETHERLANDS | PWRC | ||
| 6717 | ROYU | Royal Netherlands | RSRV | ||
| 6718 | ROYU | ROYAL NETHERLANDS STEAMSHIP CO | SCAC3 | ||
| 6719 | ROYX | Chartrand's Tank Car Service, Inc. | eliminated 1/1991 | NAKINA | |
| 6720 | ROYX | TCL, Inc. | added 7/1973; 1/1975-1/1980; eliminated 10/1988 | NAKINA | |
| 6721 | ROYX | Chartrand's Tank Car Service, Inc. | eliminated 1/91 | NRHS | |
| 6722 | ROYX | TCL, Inc. | added 7/73; 1/75-1/80; eliminated 10/88 | NRHS | |
| 6723 | ROYX | *TCL INC. | PWRC | ||
| 6724 | ROYX | *CHARTRAND'S TANK CAR SERVICE, INC. | PWRC | ||
| 6725 | ROYX | TCL | RSRV | ||
| 6726 | ROYY | ROYAL TRANSPORT LTD | SCAC4 | ||
| 6727 | ROZB | ROZELLE, BENJAMIN F | SCAC3 | ||
| 6728 | ROZI | ROZIERS OIL COMPANY | SCAC4 | ||
| 6729 | ROZK | ROZAK TRUCKING | SCAC3 | ||
| 6730 | ROZL | RIO AZUL COMPANIA ARMADORA S A | SCAC3 | ||
| 6731 | ROZL | RODRIGUEZ ZAVALA, JOSE | SCAC4 | ||
| 6732 | ROZN | ROZON, MICHEL TRANSPORT | SCAC4 | ||
| 6733 | ROZO | ROYAL MOTOR LINES INC | SCAC3 | ||
| 6734 | ROZO | RODRIGUEZ ZAMBRANO, MACARENA DEL RO | SCAC4 | ||
| 6735 | RØHJ | Ringkøbing - Ørnhøj - Holstebro Jernbane (Ørnhøjbanen) | 1925 - 1961 | DK | jernbanen.dk |
| 6736 | RP | Rompetrol Logistics | RO | TRAFFIC | |
| 6737 | RP | Railpro | NL | VKM | |
| 6738 | RPA | Republic Airlines | IATA: RW | ICAO1 | |
| 6739 | RPAC | R PACKING INC | SCAC3 | ||
| 6740 | RPAC | RAVENSTAR PACIFIC SHIPPING INC | SCAC4 | ||
| 6741 | RPAH | RANKIN, PAUL TRUCKING | SCAC4 | ||
| 6742 | RPAR | RAMPART RENTALS INC | SCAC3 | ||
| 6743 | RPAS | ROYS POOLS AND SPAS | SCAC4 | ||
| 6744 | RPAT | R & P AUTOMOTIVE (TRANSPORT DIV) | SCAC4 | ||
| 6745 | RPAX | Rhone-Poulenc Basic Chemicals Co. | eliminated 10/1992; 1/1994 (not listed) | NAKINA | |
| 6746 | RPAX | Rhone-Poulenc Basic Chemicals Co. | eliminated 10/92; 1/94 | NRHS | |
| 6747 | RPAX | RHODIA, INC. [(RPBX) RHONE-POULENC BASIC CHEMICALS COMPANY] | PWRC | ||
| 6748 | RPAZ | RAILROAD PROPERTIES ASSOCIATES | PWRC | ||
| 6749 | RPB | AeroRepública | IATA: P5 | ICAO1 | |
| 6750 | RPBS | R P B SERVICE INC | SCAC3 | ||
| 6751 | RPBT | RPB TRUCKING | SCAC4 | ||
| 6752 | RPBX | Rhodia, Inc. | added 10/1999; 7/2000; eliminated 4/2004; added 1/2005; 7/2005 | NAKINA | |
| 6753 | RPBX | Rhone-Poulenc Basic Chemicals Co. | added 4/1990; added 7/1991; 1/1994; eliminated 10/1999 | NAKINA | |
| 6754 | RPBX | Rhone-Poulenc Basic Chemicals Co. | added 4/90; added 7/91; 1/94; eliminated 10/99 | NRHS | |
| 6755 | RPBX | Rhodia, Inc. | added 10/99; 7/2000 | NRHS | |
| 6756 | RPBX | *RHONE-POULENC BASIC CHEMICALS COMPANY | PWRC | ||
| 6757 | RPBX | +RHODIA, INC. | PWRC | ||
| 6758 | RPBX | Rhodia | RSRV | ||
| 6759 | RPBX | RHODIA INC | SCAC4 | ||
| 6760 | RPC | Aerolineas Del Pacifico | ICAO1 | ||
| 6761 | RPCC | RUPP CONTRACTING CORPORATION | SCAC3 | ||
| 6762 | RPCC | ROCKPORT CARRIER COMPANY INC | SCAC4 | ||
| 6763 | RPCD | RAPID CITY DELIVERY | SCAC3 | ||
| 6764 | RPCD | REMPEL, KEITH E | SCAC4 | ||
| 6765 | RPCI | ROCKY PACIFIC SHIPPING INC | SCAC3 | ||
| 6766 | RPCI | RPK TRANSPORT INC | SCAC4 | ||
| 6767 | RPCL | RPC | SCAC4 | ||
| 6768 | RPCN | RAPID CARTAGE INC | SCAC3 | ||
| 6769 | RPCO | RAPCO DISTRIBUTING COMPANY | SCAC3 | ||
| 6770 | RPCP | RING POWER CORPORATION | SCAC4 | ||
| 6771 | RPCU | TIC PETERSBURG LTD | SCAC4 | ||
| 6772 | RPCV | R PERSONAL COURIER SERVICE | SCAC3 | ||
| 6773 | RPCX | Railroad Passenger Car Numbering Bureau Inc. | 7/2005 (not listed) | NAKINA | |
| 6774 | RPCX | Robeson Process Co. | 8/1920-10/1966; eliminated 10/1969 | NAKINA | |
| 6775 | RPCX | Ralston Purina Co. | added 1/1974; 1/1975-1/1980; eliminated 7/1989 | NAKINA | |
| 6776 | RPCX | Robeson Process Co. | 4/38-10/66; eliminated 10/69 | NRHS | |
| 6777 | RPCX | Ralston Purina Co. | added 1/74; 1/75-1/80; eliminated 7/89 | NRHS | |
| 6778 | RPCX | *ROBESON PROCESS CO. | PWRC | ||
| 6779 | RPCX | *RALSTON PURINA CO. | PWRC | ||
| 6780 | RPCX | +RAILROAD PASSENGER CAR NUMBERING BUREAU, INC. | PWRC | ||
| 6781 | RPCX | Railroad Passenger Car Numbering Bureau | RSRV | ||
| 6782 | RPCX | RAILROAD PASSENGER CAR NUMBERING BU | SCAC4 | ||
| 6783 | RPCX | Ralston Purina Co. | USA | TRAFFIC | |
| 6784 | RPCZ | RALSTON PROTEIN CO, | PWRC | ||
| 6785 | RPDA | RAPID AIR TRANSPORT INC | SCAC3 | ||
| 6786 | RPDC | R P D INC | SCAC3 | ||
| 6787 | RPDE | RAPID EXPRESS | SCAC3 | ||
| 6788 | RPDE | RAPID EXPRESS | SCAC4 | ||
| 6789 | RPDF | RAPIDO FREIGHT LINES | SCAC3 | ||
| 6790 | RPDF | RAPID FREIGHT INC | SCAC4 | ||
| 6791 | RPDI | ROSE, BILLY PARCEL DELIVERY SERVICE | SCAC3 | ||
| 6792 | RPDJ | RAPID DELIVERY SERVICE | SCAC3 | ||
| 6793 | RPDK | RIPTIDE TRUCKLING CO INC | SCAC3 | ||
| 6794 | RPDL | RAPID PACKAGE DELIVERY | SCAC3 | ||
| 6795 | RPDL | RAPID TRANSIT LLC | SCAC4 | ||
| 6796 | RPDM | RAPID MOTOR TRANSPORT | SCAC4 | ||
| 6797 | RPDO | RECUPERADORA DE METALES RIO BRAVO S | SCAC4 | ||
| 6798 | RPDP | RAPID INDUSTRIAL PLASTICS CO INC | SCAC3 | ||
| 6799 | RPDQ | RAPID SERVICE | SCAC3 | ||
| 6800 | RPDR | RAPID TRANSIT INC | SCAC3 |