| 1 | RFP | CSX Transportation, Inc. | 1/1994-7/2005 | | NAKINA |
| 2 | RFP | Richmond, Fredricksburg & Potomac Ry. Co. | added 1/1992; eliminated 7/1992 | | NAKINA |
| 3 | RFP | Richmond, Fredricksburg & Potomac R.R. Co. | 4/1938-1/1980; eliminated 1/1992 | | NAKINA |
| 4 | RFP | Richmond, Fredricksburg & Potomac R.R. Co. | 4/38-1/80; eliminated 1/92 | | NRHS |
| 5 | RFP | Richmond, Fredricksburg & Potomac Ry. Co. | added 1/92; eliminated 7/92 | | NRHS |
| 6 | RFP | CSX Transportation, Inc. | 1/94-7/2000 | | NRHS |
| 7 | RFP | CSX TRANSPORTATION, INC. [RICHMOND, FREDERICKSBURG & POTOMAC RR] | | | PWRC |
| 8 | RFP | Richmond, Fredericksburg and Potomac Railroad (CSX Transportation) | | | RSRV |
| 9 | RFP | Richmond, Fredricksburg & Potomac Railroad | | USA | TRAFFIC |
| 10 | RFPF | ROCKY FORD PET FOOD INC | | | SCAC3 |
| 11 | RFPM | REFINED PETROLEUM CO | | | SCAC3 |
| 12 | RFPO | ROSEBURG FOREST PRODUCTS CO | | | SCAC4 |
| 13 | RFPU | CSX TRANSPORTATION, INC. | | | PWRC |
| 14 | RFPU | Richmond, Fredericksburg and Potomac Railroad (CSX Transportation) | | | RSRV |
| 15 | RFPX | Merchants Despatch Transportation Corp. | 7/1937-4/1947 | | NAKINA |
| 16 | RFPX | Republic Food Products Co. (Merchants Despatch, Inc.) | 7/1935 | | NAKINA |
| 17 | RFPX | Republic Food Products Co. | 7/1932 | | NAKINA |
| 18 | RFPX | Republic Food Products Co. (Merchants Despatch Transportation Corp.) | Apr-38 | | NRHS |
| 19 | RFPX | REPUBLIC FOOD PRODUCTS CO. (MERCHANTS DESPATCH TRANSPORTATION CORP.) | | | PWRC |
| 20 | RFPZ | CSX TRANSPORTATION, INC. | | | PWRC |
| 21 | RFPZ | Richmond, Fredericksburg and Potomac Railroad (CSX Transportation) | | | RSRV |
| 22 | RFPZ | CSX TRANSPORTATION | | | SCAC4 |
