| R&F Coal Co. | RFCX | added 7/80; eliminated 7/91 | |
| R.E.M.X. Corp. | REMX | added 1/80; 1/80; eliminated 5/83 | |
| R.F. Cunningham & Co., Inc. | CUNX | added 4/91; 1/94; eliminated 10/95 | |
| R.H. Bogle Co. | RHBX | 1/52-1/80; eliminated 5/83 | |
| R.J. Allison Co. | RJAX | Jan-52 | |
| R.J. Brown Co. | RJBX | Jan-52 | |
| R.J. Corman R.R. Co./Allentown Lines, Inc. | RJCN | added 10/96; 7/2000 | |
| R.J. Corman R.R. Co./Cleveland Line | RJCL | added 10/91; 1/94-7/2000 | |
| R.J. Corman R.R. Co./Memphis Line | RJCM | added 1/90; eliminated 7/91 | |
| RJCM | added 10/91; 1/94-7/2000 | ||
| R.J. Corman R.R. Co./Pennsylvania Lines, Inc. | RJCP | added 10/96; 7/2000 | |
| R.J. Corman R.R. Co./Western Ohio Line | RJCW | 1/94; added 4/94; 7/2000 | |
| R.J. Corman R.R. Corp. | RJCR | added 4/87; 1/94-7/2000; eliminated 1/2001 | |
| R.J. Corman R.R. Corp./Bardstown Line | RJCR | added 1/2001 | |
| R.J. Roesing and Co. | FTLX | added 4/54 | |
| R.J. Roesling & Co. | RJRX | 1/52-4/61 | |
| WCTX | Jan-52 | ||
| R.L. and S.S. Klein | RLKX | added 4/84; eliminated 4/85 | |
| R.L. Aycock Co. | AYCX | Apr-38 | |
| R.P. Flynn, Inc., d/b/a Ohio Railway Supply | FLNX | Jul-00 | |
| Raccoon River R.R. Co. | RACN | added 7/81; eliminated 4/82 | |
| Radar Railcar, Inc. | RRCX | 1/94-7/2000 | |
| Rader Railcar II, Inc. | RRIX | Jul-00 | |
| Radio Oil Refineries, Ltd. | RORX | 4/38-1/52 | |
| Rahr Malting Co. | RHRX | added 4/90; 1/94; eliminated 7/99; 7/2000 | |
| Rahway Valley R.R. | RV | 4/38-4/70 | |
| RV | eliminated 10/88 | ||
| RV | eliminated 4/89 | ||
| Rahway Valley R.R. Co. (Rahway Valley Co., Lessee) | RV | 1/75-1/80 | |
| Rahway Valley R.R. Co. (transferred to New York, Susquehanna and Western Ry. Corp.) | RV | added 10/88 | |
| Rail America, Ltd. | RAMX | added 7/82; 1/94 | |
| Rail Enterprises, Inc. | IOCX | added 10/97; eliminated 4/98; 7/2000 | |
| Rail Link Inc. | RLIX | Jul-00 | |
| Rail Operators, Inc. | ROPX | added 7/93; 1/94; eliminated 4/97; 7/2000 | |
| Rail Transportation Services Inc. | RTSX | Jul-00 | |
| Rail Transportation Services, Inc. | RTSR | added 7/96 | |
| Rail Trusts Equipment Inc. | RTEX | Jul-00 | |
| RailAmerica Equipment Corp. | HDSX | added 10/96; 7/2000 | |
| Railbox Co. | RBOX | added 7/79; 1/80-1/94; eliminated 4/2000 | |
| Railbox Company | ABOX | added 7/79; 1/80-1/94; eliminated 4/2000 | |
| Railcar Leasing Specialists, Inc. | AMIX | added 1/93; 1/94-7/2000 | |
| VWCX | added 1/94-7/2000 | ||
| Railcar Maintenance Co. | MCHX | added 10/89; eliminated 4/90 | |
| Railcar, Ltd. | RCPX | added 7/97; 7/2000; eliminated 10/2000 | |
| RMGX | added 10/89; 1/94-7/2000 | ||
| RMMX | added 4/94; 7/2000 | ||
| RMPX | added 4/2000; 7/2000 | ||
| Railease Corp. | TGOX | added 4/69; eliminated 1/70 | |
| Railgon Co. | GONX | 1/80; added 7/80; 1/94-7/2000 | |
| RaiLink Canada Ltd, d/b/a RaiLink Mackenzie Northern | RLGN | added 7/98; 7/2000 | |
| RaiLink Canada Ltd, d/b/a RaiLink Ottawa Valley | RLK | added 7/98; 7/2000 | |
| RaiLink Canada Ltd, d/b/a RaiLink Southern Ontario | RLHH | added 7/98; 7/2000 | |
| RailLease Inc. | FLEX | 1/94-7/2000 | |
| RailLink Canada Ltd. | TOR | Jul-00 | |
| Railmark | CREX | added 1/89 | |
| JTHX | added 1/89 | ||
| MATX | added 1/89 | ||
| Railroad Car Management Co., Inc. | RCMX | added 4/85; eliminated 1/94 | |
| LUCX | added 1/81; eliminated 1/94 | ||
| Railroad Car Service Corp. | RCSX | added 4/85; eliminated 1/87 | |
| Railroad Salvage & Restoration, Inc. | GWAX | Jul-00 | |
| Railroad Switching Service of Missouri, Inc. | RSM | added 10/89; eliminated 7/91; 1/94-7/2000 | |
| Railserv Funding Corp. | RSVX | eliminated 7/84; eliminated 7/86 | |
| Railserv Management Corp. | RSVX | added 4/80; eliminated 7/84 | |
| Railtex Corp. | TRAX | added 7/78 | |
| TRAX | Jan-94 | ||
| Railtex Inc. | TRAX | Jan-80 | |
| TRAX | Jul-00 | ||
| RailTex Service Co., Inc. | RATX | Jul-00 | |
| Rail-U.S. Leasing, Inc. | RUSX | added 4/73; 1/75; eliminated 4/78 | |
| BFGX | eliminated 4/78 | ||
| TGOX | added 1/70; 4/70-1/75; eliminated 4/78 | ||
| Railway Accessories Co. | RACX | 10/66; eliminated 10/67 | |
| Railway Accessories Co. (J.L. Ortner) | RACX | 1/52-7/65 | |
| Railway Automated Machinery Co. | RAMX | added 7/67; 4/70; eliminated 1/71 | |
| Railway Express Agency, Inc. | REX | 1/52-4/70 | |
| Railway Management, Inc. | RWMX | added 10/91; 1/94; eliminated 4/97 | |
| Railway Marketing Corp. | LMWX | added 1/80; 1/80; eliminated 7/92 | |
| Railway Tank Car Service, Inc. | RCSX | 1/52-10/57; eliminated 7/60 | |
| Railwest US, Inc. | RWTX | added 7/98; 7/2000 | |
| Railworks Wood Waste Energy, Inc. | WWEX | added 4/2000; 7/2000 | |
| Rainey-Wood Coke Co. | RNWX | Apr-38 | |
| Ralston Purina Co. | RPCX | added 1/74; 1/75-1/80; eliminated 7/89 | |
| Rampart Range Corp. | RRBX | added 4/94; eliminated 7/99; added 10/99; 7/2000 | |
| Randolph L. Johnston | RLTX | Jul-00 | |
| Rapco Transportation Co. | RAPX | added 10/81; 1/94; eliminated 4/2000; 7/2000 | |
| Rapid Industrial Plastics Co. | RDIX | added 1/85; 1/94-7/2000 | |
| Raritan River R.R. Co. | RR | 4/38-1/80; eliminated 7/80 | |
| Rarus Ry. Co. | RARW | 1/94-7/2000 | |
| Rath Packing Co. (Mather Stock Car Co.) | RPRX | 4/38-1/52 | |
| Rausch Naval Stores Co., Inc. | RNSX | 1/52-10/66; eliminated 7/69 | |
| Ray & Gila Valley R.R. | R&GV | 4/38-1/52 | |
| REA Express | OREX | added 10/70; eliminated 4/74 | |
| REA Express | PREX | added 10/70; eliminated 4/74 | |
| REA Express, Inc. | REX | eliminated 4/74 | |
| SREX | eliminated 4/74 | ||
| Reade Manufacturing Co., Inc. | RMCX | added 7/55; 10/57-4/61 | |
| Reading Blue Mountain & Northern R.R. Co. | RBMN | 1/94; added 4/2000; 7/2000; eliminated 7/2000 | |
| Reading Co. | RDG | 4/38-1/75 | |
| Reading Co., Andrew L. Lewis, Jr. and Joseph L. Castle, Trustees | RDG | eliminated 4/76 | |
| Ready Mixed Concrete Co. | RIMX | 1/94-7/2000 | |
| RMIX | added 7/84; 1/94-7/2000 | ||
| Reagent Chemical & Research, Inc. | RCRX | added 11/73; 1/75-7/2000 | |
| Reconstruction Finance Corp. | DPX | Jan-52 | |
| Red Bank R.R. Co. | RBKX | Jan-94 | |
| Red Coat Road & Rail Ltd. | RCRR | Jul-00 | |
| Red River Valley and Western R.R. | RRVW | added 1/88; 1/94-7/2000 | |
| Red Springs and Northern R.R. Co. | RSNR | added 1/85; 1/94; eliminated 7/96; 7/2000 | |
| Redland Worth Corp. | MCDX | added 10/83; eliminated 4/86 | |
| Redmont Ry. Co., Inc. | RRCI | Jul-00 | |
| Reese Enterprises, Inc. | RTEX | 1/75; eliminated 1/79 | |
| Reese Tank Car Leasing Corp. | RTEX | added 10/68; 4/70 | |
| Reese Tank Line Co. | JIMX | added 10/58; eliminated 10/59 | |
| Refined Sugars, Inc. | RSYX | added 7/81; eliminated 10/86; 1/94-7/2000 | |
| Refined Syrups & Sugars, Inc. | RSYX | added 7/80; eliminated 7/81 | |
| Refiners Car Corp. | RCKX | Apr-38 | |
| Refinery Products Co. | RPOX | 7/65-10/66; eliminated 4/67 | |
| Refinery Products Co., Division of QuVoe Chemical Industries, Inc. | RPOX | added 4/67; 4/70; eliminated 7/70 | |
| Regent Refining (Canada) Ltd. | RRCX | 10/57; eliminated 10/58 | |
| Regional Disposal Co. | RDCX | Jul-00 | |
| Regional Recycling, L.L.C. | MIRX | Jul-00 | |
| Regional Transportation Authority | RTA | Jan-80 | |
| Reid, Murdoch & Co. | RMCX | Apr-38 | |
| Reilly Industries, Inc. | RIIX | added 4/2000; 7/2000 | |
| Reinhart Vinegars Ltd. | RVLX | added 4/62; 7/65-1/75; eliminated 7/76 | |
| Relco Leasing Corp. | RCCX | added 7/69; 4/70; eliminated 4/72 | |
| RELX | added 7/69; 4/70; eliminated 1/72 | ||
| RTLX | added 4/70; 4/70 | ||
| RTLX | Jan-94 | ||
| WRLX | added 10/71; eliminated 4/72 | ||
| Relco Rank Line, Inc. | WNDX | added 1/91; 1/94; eliminated 10/97 | |
| Relco Tank Line | RCCX | added 4/69; eliminated 7/69 | |
| RTLX | eliminated 1/72 | ||
| Relco Tank Line Division of Relco Nevada Corp. | RCCX | 1/80; eliminated 10/86 | |
| RELX | 1/80; eliminated 10/86 | ||
| RTLX | 1/80; eliminated 10/86 | ||
| WRLX | 1/80; eliminated 10/86 | ||
| Relco Tank Line, Inc. | RCCX | added 4/72; 1/75 | |
| RCCX | added 10/86; eliminated 7/87 | ||
| RELX | added 1/72; 1/75 | ||
| RELX | added 10/86; 1/94-7/2000 | ||
| RTLX | 7/65-10/66; eliminated 4/70 | ||
| RTLX | added 1/72; 1/75 | ||
| RTLX | added 10/86 | ||
| RTLX | Jul-00 | ||
| WRLX | Jan-75 | ||
| WRLX | added 10/86; eliminated 4/93; 1/94-7/2000 | ||
| Reliable Packing Co. | REPX | 10/57-4/61 | |
| Reliant Energy HL&P | HIPX | added 7/2000; 7/2000 | |
| UFIX | added 7/2000; 7/2000 | ||
| Rentco Division, Fruehauf Corp. | RFCX | added 4/67; 4/70 | |
| Republic Car Line Inc. | RTCX | added 7/64; 7/65-1/75; eliminated 7/77 | |
| Republic Food Products Co. (Merchants Despatch Transportation Corp.) | RFPX | Apr-38 | |
| Republic Gas and Utilities Corp. | RGIX | added 10/74; 1/75-7/2000; eliminated 4/2001 | |
| Republic Locomotives, Inc. | RLEX | Jul-00 | |
| Republic Oil Co. | ROTX | Apr-38 | |
| Republic Steel Corp. | RSCX | 4/38-4/70; eliminated 1/72 | |
| Republic Steel Corp. (Gulf Steel Division) | GSSX | Apr-38 | |
| Republic Tank Car Co. | RTCX | 1/52-4/61; eliminated 7/64 | |
| Rescar Inc. | RESX | added 1/78; 1/80; eliminated 5/83; 1/94-7/2000 | |
| Residco | RGTX | 1/94-7/2000 | |
| OFCX | added 7/87; 1/94-7/2000 | ||
| OFOX | added 7/88; 1/94-7/2000 | ||
| Resinera Uruapan, S. de R.L. | RUSX | 1/52-4/70; eliminated 10/70 | |
| Resolution Performance Products | RSLX | added 4/2001 | |
| RSOX | added 4/2001 | ||
| Resource Recycling Inc. | WCTX | Jul-00 | |
| Revere Sugar Refinery | RSRX | 10/57-1/75; eliminated 1/79 | |
| Rex Leasing, Inc. | RRRX | added 7/80; eliminated 1/87; added 7/87; eliminated 10/88 | |
| RRRX | added 1/93; 1/94-7/2000 | ||
| Rex Leasing, Inc. (transferred to Itel Rail Corp.) | RRRX | added 10/88 | |
| Rex Railways, Inc. | RREX | added 7/78; 1/80; eliminated 10/88 | |
| Rex Railways, Inc. (transferred to Itel Rail Corp.) | RREX | added 10/88 | |
| Reynolds Metals Co. | RMCX | added 4/69; 4/70-7/2000 | |
| Rhinelander Division, St. Regis Paper Co. | SRPX | added 1/68; 4/70-1/75 | |
| Rhodia, Inc. | RPBX | added 10/99; 7/2000 | |
| SCHX | added 10/99; 7/2000 | ||
| Rhone-Poulenc Basic Chemicals Co. | RPAX | eliminated 10/92; 1/94 | |
| RPBX | added 4/90; added 7/91; 1/94; eliminated 10/99 | ||
| CCIX | eliminated 1/94 | ||
| SCHX | added 4/90; 1/94; eliminated 10/99 | ||
| STAX | added 4/90; 1/94; eliminated 7/96 | ||
| Rhone-Poulenc Inc. | RPIX | added 1/87; 1/94; eliminated 1/96; 7/2000 | |
| Rhone-Poulenc of Wyoming Co. | SWYX | added 4/90; 1/94; eliminated 7/96 | |
| Richards Tank Car Service | ETRX | 7/65-10/66; eliminated 7/67 | |
| Richfield Oil Co. of California (Richfield Oil Corp.) | RGOX | Apr-38 | |
| Richfield Oil Corporation | ROX | 4/38-7/65; eliminated 7/66 | |
| Richmond Leasing Co. | RTMX | 1/75-1/80; eliminated 4/88 | |
| Richmond Rail Equipment Leasing Co. | SWRX | added 7/77; 1/80-1/94; eliminated 4/96 | |
| Richmond Tank Car & Manufacturing Co. | RTMX | added 4/68; eliminated 1/69; added 7/70; eliminated 10/70 | |
| Richmond, Fredricksburg & Potomac R.R. Co. | RFP | 4/38-1/80; eliminated 1/92 | |
| Richmond, Fredricksburg & Potomac Ry. Co. | RFP | added 1/92; eliminated 7/92 | |
| Richter Vinegar Corp. | RVCX | added 4/57; 10/57-1/80; eliminated 7/84 | |
| Rick Franklin Corp. | RFRX | Jul-00 | |
| Rieck-McJunkin Dairy Co. | RMJX | Apr-38 | |
| Riley Stoker Corp. | RSUX | added 1/68; 4/70-1/94; eliminated 7/98; 7/2000 | |
| UIWX | added 4/70; 4/70-1/94; eliminated 7/98 | ||
| Ringgold Coal Mining Co. | RCMX | Jan-80 | |
| Ringling Bros. and Barnum & Bailey | RBBX | Jul-00 | |
| Ring's Gas & Appliance Co. | RGHX | added 4/73; 1/75; eliminated 4/79 | |
| Rinker Materials Corp. | KAIX | added 1/89; 1/94-7/2000 | |
| Rio Grande Chemical Sales Co. | RGCX | added 4/79; 1/80-7/2000 | |
| Rio Grande Railcar Co., Inc. | RGRX | 1/94-7/2000 | |
| Rio Valley R.R., Inc. | RVRR | 1/94; added 4/94; eliminated 1/95; eliminated 4/95 | |
| Rio Valley Switching Co. | RVSC | added 1/95; added 4/95; eliminated 7/96; eliminated 4/97; 7/2000; added 1/2001 | |
| Riverport R.R., L.L.C. | RVPR | Jul-00 | |
| Riverside Acid & Inhibitor Co. | RAWX | Jan-52 | |
| Riverside Acid Works | RAWX | Apr-38 | |
| Riverside Chemical Co. | RSEX | added 1/75; 1/75; eliminated 4/78 | |
| Riverside Gas Co. | RGCX | added 1/65; 7/65; eliminated 10/66 | |
| Robert F. Miller | RFMX | added 1/74; 1/75-1/80 | |
| Robert L. Shipp | RLSX | added 10/83; eliminated 1/90 | |
| Roberto de la Garza y Hnos, S.A. | RGLX | eliminated 1/83 | |
| RLGX | 10/57-1/80 | ||
| Roberts & Oake, Inc. (General American Transportation Corp.) | RAOX | Apr-38 | |
| Robertson Terminals, Inc. | TECX | 1/75; eliminated 1/77 | |
| Roberval and Saguenay Ry. Co. | RS | Apr-38 | |
| RS | 10/66 & 1/75-7/2000 | ||
| Roberval-Saguenay Ry. | RS | 1/52-4/70 | |
| Robeson Process Co. | RPCX | 4/38-10/66; eliminated 10/69 | |
| Robson Leather Co., Ltd. | ROLX | added 7/60; 4/61-4/70; eliminated 7/70 | |
| Roby Tank Line (American Maize Products Co.) | RTLX | Apr-38 | |
| Rochelle R.R. Co. | RRCO | Jul-00 | |
| Rochester & Southern R.R., Inc. | RSR | added 10/86; eliminated 7/93; 1/94-7/2000 | |
| Rochester Independent Packer, Inc. | RIPX | added 7/69; 4/70-1/80; eliminated 5/83; 1/94 | |
| Rochester Subway | RSB | 1/80-7/2000 | |
| Rock & Rail, Inc. | RRRR | Jul-00 | |
| Rock Island (Chicago, Rock Island & Pacific Ry. Co.) | RI | 4/38-1/80; eliminated 7/80 | |
| Rock Island Improvement Co. | ROCX | added 1/79; 1/80; eliminated 7/80 | |
| Rock Island Refining Co. (Duncan Oil Co., Inc.) | RIRX | Apr-38 | |
| Rock Island Southern Ry. | RIS | 4/38-1/52 | |
| Rockdale, Sandow & Southern R.R. Co. | RSS | 1/75-1/80; added 7/80; 1/94-7/2000 | |
| Rockingham R.R. Co. | RKG | 4/38-10/66 | |
| Rockton & Rion Ry. | ROR | 1/75-1/80 | |
| Rockwell International Corp. | RICX | 1/94-7/2000 | |
| Rocky Mountain Rail Society | RMAX | Jul-00 | |
| Rocky Mountain Railcar and R.R., Inc. | RMRR | added 10/87; eliminated 1/91; added 10/91; 1/94; eliminated 1/97; 7/2000 | |
| Rocky Mountain Transportation Services | ROCX | added 7/95; 7/2000 | |
| RTRX | added 7/95; 7/2000 | ||
| BTRX | Jul-00 | ||
| MTNX | added 4/96; 7/2000 | ||
| Rohm and Haas Co. | RAHX | 4/38-1/75; eliminated 7/78; added 4/90; 1/94; added 7/94; 7/2000 | |
| Ron Johnson & Associates | SXSX | 1/94-7/2000 | |
| Ronald L. Boothman Remainder Trust | DYLX | added 4/84; eliminated 4/85 | |
| KEBX | added 4/84; 1/94-7/2000 | ||
| Root Petroleum Co. | RUTX | Apr-38 | |
| Roscoe, Snyder & Pacific Ry. | RS&P | Apr-38 | |
| RSP | 4/61 & 4/70-1/80; eliminated 1/89; eliminated 4/89 | ||
| RSP | 7/65-10/66 | ||
| Roscoe, Snyder and Pacific Ry. Co. | RSP | 1/94-7/2000 | |
| Rosman Tanning Extract Co. | RTEX | Apr-38 | |
| Rosslyn Connecting R.R. Co. | RC | 1/75-1/80 | |
| Round Butte Products | LYNX | added 10/96; eliminated 4/98; 7/2000 | |
| Rowena Mathis | RMX | Apr-38 | |
| Roxana Petroleum Corp. (Shell Petroleum Corp.) | RPX | Apr-38 | |
| Roy O. Martin Lumber Co., Inc. | ROMX | added 10/68; 4/70; eliminated 1/71 | |
| Royal Gas Products Corp. | RGPX | Apr-61 | |
| Royal Gorge Industries, LLC | RGEX | Jul-00 | |
| Royal Oak Charcoal Co., Northern Division | CDKX | added 10/68; eliminated 10/69 | |
| Roylease Ltd. | CPLX | added 7/78; 1/80; eliminated 10/81 | |
| Royster Chemical Works | RCWX | Apr-38 | |
| RCWX | eliminated 10/59 | ||
| Royster Co. | RCWX | added 10/68; 4/70-1/75 | |
| RPI-AAR Cooperative Test Program | RAX | 1/75-7/2000 | |
| RSL Corp. | RSLX | added 10/78; 1/80; eliminated 10/84 | |
| RSP Car Co. | RSPX | added 7/60; 4/61-10/66; eliminated 4/70 | |
| RSP Motor Transport Co. | RSTX | added 4/69; 4/70; eliminated 1/72 | |
| RSTX Inc. | RSTX | added 1/72; 1/75-1/80; added 1/86; eliminated 10/88 | |
| RTI--Railroad Services | RTIX | Jul-00 | |
| Ruddy Tank Car Co. | RUDX | added 10/68; 4/70-7/2000 | |
| Rural Natural Gas Co. | RNGX | 1/52-4/61 | |
| Rustless Iron Corp. of America | RICX | 1/52-4/61 | |
| Rutland Line, Inc. | RL | Jul-00 | |
| Rutland Ry. | R | 4/38-4/70 | |
| RWC, Inc. | RWCX | 1/94-7/2000 | |