| 501 | RASR | ROTTERDAM AGENCY SERVICES B V | SCAC4 | ||
| 502 | RASS | ROBBEN, AUGUST SONS INC | SCAC3 | ||
| 503 | RAST | R & S TRUCK CO | SCAC3 | ||
| 504 | RASV | RM AUTOMATIZACION SA DE CV | SCAC4 | ||
| 505 | RASW | REGIONAL AUTO SALES | SCAC4 | ||
| 506 | RASX | C.A. Rasmussen | 7/2000-7/2005 (not listed) | NAKINA | |
| 507 | RASX | C.A. Rasmussen | Jul-00 | NRHS | |
| 508 | RASX | *RAIL SERVE | PWRC | ||
| 509 | RASX | +C. A. RASMUSSEN | PWRC | ||
| 510 | RASX | C.A. Rasmussen | RSRV | ||
| 511 | RASX | C A | SCAC4 | ||
| 512 | RAT | Chief Rat Flight Services | ICAO1 | ||
| 513 | RAT | City: Craiova | RO | TRAFFIC | |
| 514 | RAT | Rent A Train GmbH | DE | VKM | |
| 515 | RATA | RAPID TRANSIT INC | SCAC3 | ||
| 516 | RATB | RATLIFF BROS AND CO | SCAC3 | ||
| 517 | RATB | ROADSIDE AUTO & TRUCK TRANSPORT INC | SCAC4 | ||
| 518 | RATB | Regia Autonomă de Transport București | City: Bucharest | RO | TRAFFIC |
| 519 | RATC | RATA ASSOCIATES INC | SCAC3 | ||
| 520 | RATC | R & A TRUCKING INC | SCAC4 | ||
| 521 | RATC | Royal Army Transport Corps | TRAFFIC | ||
| 522 | RATD | RAMPANT DEVELOPMENT CORPORATION | SCAC3 | ||
| 523 | RATD | RATD INC | SCAC4 | ||
| 524 | RATE | RAIL-TRAIL CO | SCAC3 | ||
| 525 | RATE | RATEP RENOVATIONS INC | SCAC4 | ||
| 526 | RATF | ROULOTTES ACADIE TRAILERS INC | SCAC4 | ||
| 527 | RATG | RAYNORS TRUCKING INC | SCAC3 | ||
| 528 | RATH | R & A TRANSPORT | SCAC4 | ||
| 529 | RATI | RAPID AIR TRUCK INC | SCAC3 | ||
| 530 | RATI | RITAS ABSOLUTE TRUCKING INC | SCAC4 | ||
| 531 | RATK | RANGER TRUCK INC | SCAC3 | ||
| 532 | RATK | RAT | SCAC4 | ||
| 533 | RATL | RAMUS TRUCKING LINE INC | PWRC | ||
| 534 | RATL | RAMUS TRUCKING LINE, INC | SCAC3 | ||
| 535 | RATL | R & A TRANSPORTATION LOGISTICS | SCAC4 | ||
| 536 | RATM | RATLEYS MOBILE HOME SALES | SCAC3 | ||
| 537 | RATM | R A TRANSPORT INC | SCAC4 | ||
| 538 | RATN | RATLIFF TRUCKING CORPORATION INC | SCAC3 | ||
| 539 | RATN | ROBINSON AUTO TRANSPORT LLC | SCAC4 | ||
| 540 | RATO | R A TRANSPORT LLC | SCAC4 | ||
| 541 | RATP | RAYS TRANSPORTATION INC | SCAC3 | ||
| 542 | RATP | R A TRANSPORT INC | SCAC4 | ||
| 543 | RATP | Régie Autonome des Transports Parisiens | FR | VKM | |
| 544 | RATQ | RATCLIFF TRUCKING SERVICE | SCAC3 | ||
| 545 | RATR | R A TRANSPORTATION SERVICE LLC | SCAC4 | ||
| 546 | RATS | R A TRANSPORT INC | SCAC4 | ||
| 547 | RATU | Royal Atlantic | RSRV | ||
| 548 | RATU | ARMSTRONG (TRANSPORT) | SCAC3 | ||
| 549 | RATU | ROYAL ATLANTIC LLC | SCAC4 | ||
| 550 | RATV | RATAL TRAVEL & TOURS | SCAC3 | ||
| 551 | RATW | R & A TRANSPORT INC | SCAC4 | ||
| 552 | RATX | RailTex Service Co., Inc. | 7/2000-7/2005 (not listed) | NAKINA | |
| 553 | RATX | RailTex Service Co., Inc. | Jul-00 | NRHS | |
| 554 | RATX | RAILTEX SERVICE CO. | PWRC | ||
| 555 | RATX | RailTex Service | RSRV | ||
| 556 | RATX | RAILTEX SERVICE CO INC | SCAC4 | ||
| 557 | RATY | R & A TRUCKING LLC | SCAC4 | ||
| 558 | RAU | Uganda Royal Airways | ICAO1 | ||
| 559 | RAUE | RAUSSER DISTRIBUTING COMPANY INC | SCAC3 | ||
| 560 | RAUE | RAMON LOSOYA, ISABEL AURELIA | SCAC4 | ||
| 561 | RAUI | ROLLINS AUTO TRANSPORT INC | SCAC3 | ||
| 562 | RAUL | RAMOS FUEL | SCAC4 | ||
| 563 | RAUM | RAUSCHER, MARTIN | SCAC3 | ||
| 564 | RAUN | RODGAR AUTOTRANSPORTES | SCAC4 | ||
| 565 | RAUO | ROBERTS AUTO TRANSPORT | SCAC3 | ||
| 566 | RAUP | RAU, PAUL | SCAC3 | ||
| 567 | RAUR | RAUSCH TRANSPORT INC | SCAC3 | ||
| 568 | RAUS | RAUSEO PETROLEUM INC | SCAC4 | ||
| 569 | RAV | Reed Aviation | ICAO1 | ||
| 570 | RAVA | RAVALLI MOTOR FREIGHT | SCAC3 | ||
| 571 | RAVEN | Raven Trading s.r.o. | CZ | VKM | |
| 572 | RAVH | RAPIER-VIEHWEG & ASSOCIATES | SCAC3 | ||
| 573 | RAVI | RAIL VAN DISTRIBUTORS INC | SCAC3 | ||
| 574 | RAVI | RAVELLO INTERNATIONAL LTD | SCAC4 | ||
| 575 | RAVL | RAVEILL, CARROLL | SCAC3 | ||
| 576 | RAVM | RAVINE MUSHROOM (1983) LTD | SCAC4 | ||
| 577 | RAVO | RAVENNA OIL COMPANY | SCAC4 | ||
| 578 | RAVP | RAVENSBERGE | SCAC4 | ||
| 579 | RAVQ | RARITAN VALLEY SHIPPING AGENT | SCAC3 | ||
| 580 | RAVQ | REAVES INC | SCAC4 | ||
| 581 | RAVR | RAVEN RENEWAL COMPANY | SCAC3 | ||
| 582 | RAVT | RAVEN TRANSFER & STORAGE | SCAC3 | ||
| 583 | RAVU | FLEX BOX LIMITED | SCAC4 | ||
| 584 | RAVX | RAVENA ARSENAL | PWRC | ||
| 585 | RAWD | RAYWOOD TRANSPORT INC | SCAC4 | ||
| 586 | RAWH | RAWHIDE CARRIERS INC | SCAC3 | ||
| 587 | RAWJ | RAWLEY, J W | SCAC3 | ||
| 588 | RAWL | RAWLINGS TRUCK LINES INC | SCAC3 | ||
| 589 | RAWL | RAWL, WALTER P & SONS INC | SCAC4 | ||
| 590 | RAWM | RAWLINGS, WADE MORRIS | SCAC4 | ||
| 591 | RAWO | R & W TRUCKING CO INC | SCAC3 | ||
| 592 | RAWO | RINGS AROUND THE WORLD LTD | SCAC4 | ||
| 593 | RAWP | Rechsbahn Ausbesserungswerke Potsdam | D | TRAFFIC | |
| 594 | RAWQ | RAWLS OIL SERVICE | SCAC3 | ||
| 595 | RAWR | RARUS RAILWAY COMPANY | PWRC | ||
| 596 | RAWS | R A | SCAC4 | ||
| 597 | RAWU | QUANZHOU YIYANG CONTAINER SERVICE C | SCAC4 | ||
| 598 | RAWX | Platte River Power Authority | added 4/1984; eliminated 4/1990; 1/1994-7/2005 (not listed) | NAKINA | |
| 599 | RAWX | Riverside Acid & Inhibitor Co. | 1/1943-1/1952; eliminated 7/1953 | NAKINA | |
| 600 | RAWX | Riverside Acid Works | 7/1930-1/1941 | NAKINA |