| 7801 | RSLX | Shell Epoxy Resins | added 1/2001; eliminated 4/2001 | NRHS | |
| 7802 | RSLX | Resolution Performance Products | added 4/2001 | NRHS | |
| 7803 | RSLX | *RSL CORPORATION | PWRC | ||
| 7804 | RSLX | *RESOLUTION PERFORMANCE PRODUCTS [SHELL EPOXY RESINS] | PWRC | ||
| 7805 | RSLX | +HEXION SPECIALTY CHEMICALS, INC. | PWRC | ||
| 7806 | RSLX | RSL Corporation | RSRV | ||
| 7807 | RSLX | HEXION SPECIALITY CHEMICALS INC | SCAC4 | ||
| 7808 | RSM | Air Somalia | ICAO1 | ||
| 7809 | RSM | Railroad Switching Service of Missouri, Inc. | added 10/1989; eliminated 7/1991; 1/1994-7/2005 | NAKINA | |
| 7810 | RSM | Railroad Switching Service of Missouri, Inc. | added 10/89; eliminated 7/91; 1/94-7/2000 | NRHS | |
| 7811 | RSM | RAILROAD SWITCHING SERVICE OF MISSOURI, INC. | PWRC | ||
| 7812 | RSM | Railroad Switching Service of Missouri | RSRV | ||
| 7813 | RSMB | RODRIGUEZ SANTA MARIA, ROBERTO | SCAC4 | ||
| 7814 | RSMC | ROSE MARIE INCORPORATED | SCAC4 | ||
| 7815 | RSMD | ROSE, MICHAEL DAMON | SCAC3 | ||
| 7816 | RSMD | ROSEMAR LIMITED | SCAC4 | ||
| 7817 | RSME | RASMUSSEN MANAGEMENT | SCAC3 | ||
| 7818 | RSMG | RS MOVING & STORAGE SOLUTIONS INC | SCAC4 | ||
| 7819 | RSMH | RAIL SCALE MINIATURES | SCAC4 | ||
| 7820 | RSMK | R SAN MIGUEL TRUCKING | SCAC4 | ||
| 7821 | RSMM | RUSHMORE TRANSPORTATION LTD | SCAC4 | ||
| 7822 | RSMN | ROSEMONT TRANSPORT INC | SCAC4 | ||
| 7823 | RSMO | ROSE MOVING & STG CO INC | SCAC3 | ||
| 7824 | RSMO | ROSE MOVING & STORAGE CO INC | SCAC4 | ||
| 7825 | RSMP | RUSMIN TRUCKING | SCAC3 | ||
| 7826 | RSMP | RS MOTORSPORTS | SCAC4 | ||
| 7827 | RSMQ | RASMUSSEN SERVICE INC | SCAC3 | ||
| 7828 | RSMQ | ROSAS, M TRANSPORT | SCAC4 | ||
| 7829 | RSMS | ROUSH MOVING & STORAGE CO | SCAC3 | ||
| 7830 | RSMT | R S M TRANSPORT INC | SCAC3 | ||
| 7831 | RSMT | ROSS MARITIME INC | SCAC4 | ||
| 7832 | RSMU | REMUS MARINE CO., INC. | SCAC3 | ||
| 7833 | RSMW | RED SEA MARINE C/O NORDIC MARITIME | SCAC4 | ||
| 7834 | RSMY | R S M TRUCKING LLC | SCAC4 | ||
| 7835 | RSN | Royal Swazi National Airways | ICAO1 | ||
| 7836 | RSNA | ROSSANA VAN LINES | SCAC3 | ||
| 7837 | RSNC | ROBERTS & SONS CARTAGE CO | SCAC3 | ||
| 7838 | RSNC | RS TRANSFER SA DE CV | SCAC4 | ||
| 7839 | RSNE | RESNER, PHIL TRUCKING | SCAC4 | ||
| 7840 | RSNF | ROSEN FORWARDERS INC | SCAC3 | ||
| 7841 | RSNG | ROSSING TRUCK CO | SCAC3 | ||
| 7842 | RSNI | READS MOVING SYSTEMS OF NORFOLK INC | SCAC4 | ||
| 7843 | RSNJ | ROSENO TRUCKING | SCAC4 | ||
| 7844 | RSNK | RED SUN TRANSPORT CO | SCAC4 | ||
| 7845 | RSNM | RESENDES | SCAC4 | ||
| 7846 | RSNN | ROBISON & SONS DAIRY | SCAC4 | ||
| 7847 | RSNO | ROSIN TRANSPORT | SCAC4 | ||
| 7848 | RSNR | Red Springs and Northern R.R. Co. | added 1/1985; 1/1994; eliminated 7/1996; 7/2000-7/2005 | NAKINA | |
| 7849 | RSNR | Red Springs and Northern R.R. Co. | added 1/85; 1/94; eliminated 7/96; 7/2000 | NRHS | |
| 7850 | RSNR | RED SPRINGS & NORTHERN RAILROAD CO. | PWRC | ||
| 7851 | RSNR | Red Springs and Northern Railroad | RSRV | ||
| 7852 | RSNR | RED SPRINGS NORTHERN RAILROAD CO | SCAC3 | ||
| 7853 | RSNS | RISING STAR TRANSPORTATION INC | SCAC4 | ||
| 7854 | RSNV | RED SPIRIT NAVIGATION LIMITED, MALT | SCAC4 | ||
| 7855 | RSNX | Railrunner N.A., Inc. | added 1/2004 | NAKINA | |
| 7856 | RSNX | RAILRUNNER N.A., INC. | PWRC | ||
| 7857 | RSNY | REPUBLIC STEEL (NEW YORK) | PWRC | ||
| 7858 | RSNY | RAVENSCROFT SHIPPING INC, NY | SCAC3 | ||
| 7859 | RSNY | RAVENSCROFT SHIP MANAGEMENT INC | SCAC4 | ||
| 7860 | RSO | Aero Asia International | IATA: E4 | ICAO1 | |
| 7861 | RSOA | R S OIL CORPORATION | SCAC4 | ||
| 7862 | RSOC | RSO INC | SCAC3 | ||
| 7863 | RSOD | RESOURCE DISTRIBUTION INC | SCAC3 | ||
| 7864 | RSOG | RUSSOM TRUCKING INC | SCAC4 | ||
| 7865 | RSOI | RIVERSIDE OIL INC | SCAC3 | ||
| 7866 | RSOL | RESEARCH SOLVENTS AND CHEMICALS INC | SCAC4 | ||
| 7867 | RSOM | ROSS OIL CO INC | SCAC4 | ||
| 7868 | RSOP | ROSE OF SHARON TRANSPORTATION LLC | SCAC4 | ||
| 7869 | RSOR | Riceboro Southern Ry., LLC | added 1/2005; 7/2005; eliminated 7/2006 | NAKINA | |
| 7870 | RSOR | RICEBORO SOUTHERN RAILWAY | PWRC | ||
| 7871 | RSOR | Riceboro Southern Railway | RSRV | ||
| 7872 | RSOR | RICEBORO SOUTHERN RAILWAY LLC | SCAC4 | ||
| 7873 | RSOT | RUSSO TRUCKING INC | SCAC4 | ||
| 7874 | RSOX | General Electric Rail Services Corp. | added 10/2001; 7/2005 | NAKINA | |
| 7875 | RSOX | Resolution Performance Products | added 4/2001; eliminated 10/2001 | NAKINA | |
| 7876 | RSOX | Shell Epoxy Resins | added 1/2001; eliminated 4/2001 | NAKINA | |
| 7877 | RSOX | Shell Epoxy Resins | added 1/2001; eliminated 4/2001 | NRHS | |
| 7878 | RSOX | Resolution Performance Products | added 4/2001 | NRHS | |
| 7879 | RSOX | *RESOLUTION PERFORMANCE PRODUCTS [SHELL EPOXY RESINS] | PWRC | ||
| 7880 | RSOX | +GENERAL ELECTRIC RAIL SERVICES CORP.) | PWRC | ||
| 7881 | RSOX | General Electric Rail Services Corporation | RSRV | ||
| 7882 | RSOX | GENERAL ELECTRIC RAILCAR SERVICES C | SCAC4 | ||
| 7883 | RSP | Roscoe, Snyder & Pacific Ry. | 7/1965-10/1966 | NAKINA | |
| 7884 | RSP | Roscoe, Snyder and Pacific Ry. Co. | 1/1994-7/2005 | NAKINA | |
| 7885 | RSP | Roscoe, Snyder & Pacific Ry. | 4/1961 & 4/1970-1/1980; eliminated 1/1989; eliminated 4/1989 | NAKINA | |
| 7886 | RSP | Roscoe, Snyder & Pacific Ry. | 4/61 & 4/70-1/80; eliminated 1/89; eliminated 4/89 | NRHS | |
| 7887 | RSP | Roscoe, Snyder and Pacific Ry. Co. | 1/94-7/2000 | NRHS | |
| 7888 | RSP | Roscoe, Snyder & Pacific Ry. | 7/65-10/66 | NRHS | |
| 7889 | RSP | ROSCOE, SNYDER & PACIFIC RAILWAY CO. | PWRC | ||
| 7890 | RSP | Roscoe, Snyder and Pacific Railway | RSRV | ||
| 7891 | RSPA | RAVENNAVI SPA | SCAC3 | ||
| 7892 | RSPA | RAILSIDE SPORTS & MARINE | SCAC4 | ||
| 7893 | RSPB | REDEARTH SPIRIT | SCAC4 | ||
| 7894 | RSPC | RISINGER BROS TRANSFER INC | SCAC4 | ||
| 7895 | RSPE | ROSSINI SPECIALTIES LTD | SCAC3 | ||
| 7896 | RSPG | RICHOCEAN SHIPPING AGENCY SA HONG K | SCAC3 | ||
| 7897 | RSPI | R/S TRANSPORT INC | SCAC3 | ||
| 7898 | RSPL | RONDEL SHIPPING LTD | SCAC3 | ||
| 7899 | RSPL | RED STAR PETROLEUM LLC | SCAC4 | ||
| 7900 | RSPM | ROSS PETROLEUM INC | SCAC4 |