| 8601 | RTS | Rail Transport Service Germany GmbH | München (Ableger von RTS Austria - Swietelsky) | D | privat-bahn.de |
| 8602 | RTS | RICHARDS TRANSPORTATION SERVICE INC | SCAC4 | ||
| 8603 | RTS | Rail Transport Service GmbH | A | TRAFFIC | |
| 8604 | RTS | RTS Rail Transport Service GmbH | AT | VKM | |
| 8605 | RTSA | RIVERSIDE TRUCK & STORAGE CO | SCAC3 | ||
| 8606 | RTSA | Rail Technical Support | Real: rts | AUS | TRAFFIC |
| 8607 | RTSB | RELIABLE TRANSPORTATION SOLUTIONS L | SCAC4 | ||
| 8608 | RTSC | RILEY TRUCKING SERVICE INC | SCAC3 | ||
| 8609 | RTSC | RTS | SCAC4 | ||
| 8610 | RTSC | RTS Rail Traction Services (Switzerland) AG | Real: RTS | CH | TRAFFIC |
| 8611 | RTSD | R T S TRUCKING LLC | SCAC4 | ||
| 8612 | RTSE | RTS ENTERPRISES | SCAC3 | ||
| 8613 | RTSF | RUTLAND TOOL SERVICE INC | SCAC3 | ||
| 8614 | RTSF | RUSSELLS TREE & SHRUB FARM LLC | SCAC4 | ||
| 8615 | RTSH | RT SYSTEMS INC | SCAC3 | ||
| 8616 | RTSI | ROBINHOOD TOWING SERVICE | SCAC3 | ||
| 8617 | RTSI | ROBINHOOD TOWING SERVICE | SCAC4 | ||
| 8618 | RTSJ | R T S TRANSPORTATION INC | SCAC3 | ||
| 8619 | RTSK | RUST & SONS TRUCKING INC | SCAC4 | ||
| 8620 | RTSL | RICHARDSON TRANSPORT LTD | SCAC3 | ||
| 8621 | RTSM | RTS TRANSPORTATION SYSTEMS INC | SCAC3 | ||
| 8622 | RTSN | RTS INVESTMENT CORPORATION | SCAC3 | ||
| 8623 | RTSN | REAVES TRANSPORTATION SERVICES LLC | SCAC4 | ||
| 8624 | RTSO | RAINS TRUCKING SERVICE INC | SCAC3 | ||
| 8625 | RTSQ | RAPID TRANSFER & STORAGE CO | SCAC3 | ||
| 8626 | RTSQ | RAPID TRANSFER & STORAGE CO | SCAC4 | ||
| 8627 | RTSR | Rail Transportation Services, Inc. | added 7/1996 | NAKINA | |
| 8628 | RTSR | Rail Transportation Services, Inc. | added 7/96 | NRHS | |
| 8629 | RTSR | RAIL TRANSPORTATION SERVICES, INC. | PWRC | ||
| 8630 | RTSR | RICHMOND TRAFFIC SERVICES INC | SCAC3 | ||
| 8631 | RTSRC | Regional Transit Service | in Riverside, California | USA | TRAFFIC |
| 8632 | RTSS | ROADCO TRANSPORTATION SERVICES, INC. | SCAC3 | ||
| 8633 | RTSS | ROADCO TRANSPORTATION SERVICES INC | SCAC4 | ||
| 8634 | RTST | ROOTS TRANSFER INC | SCAC3 | ||
| 8635 | RTSU | RENT TANK AG | SCAC3 | ||
| 8636 | RTSU | ROBERT KUKLA GMBH | SCAC4 | ||
| 8637 | RTSW | RAM TRANS SYSTEMS INC | SCAC3 | ||
| 8638 | RTSW | R T S | SCAC4 | ||
| 8639 | RTSX | Rail Transportation Services Inc. | 7/2000; eliminated 10/2002; 7/2005 (not listed) | NAKINA | |
| 8640 | RTSX | Rail Transportation Services Inc. | Jul-00 | NRHS | |
| 8641 | RTSX | RAIL TRANSPORTATION SERVICES, INC. | PWRC | ||
| 8642 | RTSX | Rail Transportation Services | RSRV | ||
| 8643 | RTSY | RAM TRANSPORT SYSTEMS INC | SCAC3 | ||
| 8644 | RTSY | RTS MOVING SERVICES | SCAC4 | ||
| 8645 | RTT | RIVER TRAILS TRANSIT LINES INC | SCAC4 | ||
| 8646 | RTT | RAILTRANSPORT s.r.o. | CZ | VKM | |
| 8647 | RTTA | R T TRANSPORTATION INCORPORATED | SCAC3 | ||
| 8648 | RTTC | REFINERS TRANSPORT & TERMINAL CORPO | SCAC3 | ||
| 8649 | RTTD | R T TRANSPORT INC | SCAC3 | ||
| 8650 | RTTE | RT&T ENTERPRISES INC | SCAC4 | ||
| 8651 | RTTF | R & T TRANSPORT | SCAC3 | ||
| 8652 | RTTH | RITTER TRUCKING | SCAC3 | ||
| 8653 | RTTI | ROTTIER TRUCKING INC | SCAC3 | ||
| 8654 | RTTJ | RTTJ TRANSPORTATION INC | SCAC3 | ||
| 8655 | RTTK | R T TRUCKING INC | SCAC4 | ||
| 8656 | RTTL | REUTER, TODD TRUCKING LLC | SCAC4 | ||
| 8657 | RTTM | RYAN, TIM TRUCKING LLC | SCAC4 | ||
| 8658 | RTTN | R T TRANSPORTATION | SCAC4 | ||
| 8659 | RTTP | RITTER TRANSPORTATION | SCAC3 | ||
| 8660 | RTTR | RTR TRANSPORTATION SERVICES | SCAC4 | ||
| 8661 | RTTS | R T T S INC | SCAC4 | ||
| 8662 | RTTT | RITTER TRUCKING | SCAC3 | ||
| 8663 | RTTU | RASA TECHNOLOGY TAIWAN LTD | SCAC4 | ||
| 8664 | RTTV | ROYS TOW & TRANSPORT SERV | SCAC3 | ||
| 8665 | RTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | NAKINA | |
| 8666 | RTTX | Trailer Train Co. | added 1/1961; 4/1961-1/1980; eliminated 7/1984; added 7/1986; eliminated 1/1992 | NAKINA | |
| 8667 | RTTX | Rapid Transit Tank Car Line | 7/1923 | NAKINA | |
| 8668 | RTTX | Trailer Train Co. (not defined) | added 1/1961; 4/1961 | NAKINA | |
| 8669 | RTTX | Trailer Train Co. (FCS flat cars equipped with tri-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 4/1963 | NAKINA | |
| 8670 | RTTX | Trailer Train Co. (FA flat cars equipped with tri-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 7/1965-10/1968 | NAKINA | |
| 8671 | RTTX | Trailer Train Co. (flat cars, equipped with fixed tri-level auto racks furnished by participant railroads) | 4/1970-1/1980 | NAKINA | |
| 8672 | RTTX | Trailer Train Co. | eliminated 7/1984 | NAKINA | |
| 8673 | RTTX | Trailer Train Co. (standard deck, 3-hitch flat cars with non-collapsible hitches at the ends of the car and a collapsible hitch at the centre of the car, capable of carrying 3-28' trailers with kingpin spacing of 36"" or less, or any two trailers with 36"" kingpin spacing, whose overall combined length does not exceed 90' (i.e. 2-45', 1-42' & 1-48', 1-40' & 1-48', etc.), between lift-on/lift-off facilities only) | 7/1985 | NAKINA | |
| 8674 | RTTX | Trailer Train Co./TTX Co. (89' and 360' TOFC cars. 89' cars (6 digit car numbers other than 165000 series) are standard deck, 3-hitch flatcars with non-collapsable hitches at the ends of the car and a collapsable hitch at the centre of the car, capable of carrying 3-28' trailers with kingpin spacing of 36"" or less, or any two trailers with 36"" kingpin spacing, whose overall combined length does not exceed 90' — i.e., 2-45', 1-42' & 1-48', 1-40' & 1-48', etc. — between lift-on/lift-off facilities only. 360 | added 7/1986; 10/1991-1/1992 | NAKINA | |
| 8675 | RTTX | TTX Co. (89' and 178' TOFC Flat cars. 89' cars (6 digit car numbers other than 165000 series) are standard deck, 3-hitch flatcars with non-collapsable hitches at the ends of the car and a collapsable hitch at the centre of the car, capable of carrying 3-28' trailers with kingpin spacing of 36"" or less, or any two trailers with 36"" kingpin spacing, whose overall combined length does not exceed 90' — i.e., 2-45', 1-42' & 1-48', 1-40' & 1-48', etc. — between lift-on/lift-off facilities only. 178' cars (6 dig | 1/1994-7/2000 | NAKINA | |
| 8676 | RTTX | Trailer Train Co. | 4/61-7/65 | NRHS | |
| 8677 | RTTX | Trailer Train Co. (FA flat cars equipped with tri-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates) | 10/66-10/68 | NRHS | |
| 8678 | RTTX | Trailer Train Co. | Apr-70 | NRHS | |
| 8679 | RTTX | Trailer Train Co. (flat cars, equipped with fixed tri-level auto racks furnished by participant railroads) | 1/75-1/80 | NRHS | |
| 8680 | RTTX | Trailer Train Co. | eliminated 7/84 | NRHS | |
| 8681 | RTTX | Trailer Train Co. | added 7/86; eliminated 1/92 | NRHS | |
| 8682 | RTTX | TTX Co. | added 1/92 | NRHS | |
| 8683 | RTTX | TTX Co. (89' and 178' TOFC Flat cars. 89' cars (6 digit car numbers other than 165000 series) are standard deck, 3-hitch flatcars with non-collapsable hitches at the ends of the car and a collapsable hitch at the centre of the car, capable of carrying 3 28' trailers with kingpin spacing of 36" or less, or any two trailers with 36" kingpin spacing, whose overall combined length does not exceed 90' -- i.e., 2-45', 1-42' & 1-48', 1-40' & 1-48', etc. -- between lift on/lift off facilities only. 178' cars (6 dig | 1/94-7/2000 | NRHS | |
| 8684 | RTTX | *RAPID TRANSIT TANK CAR LINE | PWRC | ||
| 8685 | RTTX | +TTX COMPANY | PWRC | ||
| 8686 | RTTX | TTX Corporation | RSRV | ||
| 8687 | RTTX | TTX COMPANY | SCAC4 | ||
| 8688 | RTTY | ROCKY TOP TRUCKING | SCAC4 | ||
| 8689 | RTTZ | UP [(REAZ) RETIRED 04-06-93 ATP (ACI 2384)] | PWRC | ||
| 8690 | RTTZ | Union Pacific Railroad | RSRV | ||
| 8691 | RTU | Aerotucan | ICAO1 | ||
| 8692 | RTUC | R & R TRUCKING | SCAC3 | ||
| 8693 | RTUC | R & T TRUCK INC | SCAC4 | ||
| 8694 | RTUD | RENTALS UNLIMITED INC | SCAC3 | ||
| 8695 | RTUE | RODAN TRANSPORT USA LTD | SCAC4 | ||
| 8696 | RTUG | RATH TRUCKING, INC | SCAC3 | ||
| 8697 | RTUG | RATH TRUCKING INC | SCAC4 | ||
| 8698 | RTUI | RUSSELL TRUCKING INC | SCAC3 | ||
| 8699 | RTUL | Rail Technologie und Logistics GmbH | Magdeburg | D | privat-bahn.de |
| 8700 | RTUL | ROLLEN TRUCK LINES INC | SCAC3 |