| Railroad | Records | Links |
|---|
| Totals | 26,537 | 990 |
|---|
| Racine and Mississippi Railroad | 25 | |
| Railway Transfer Company of Minneapolis | 6 | |
| Raleigh and Cape Fear Railway | 3 | |
| Raleigh and Gaston Railroad | 18 | 3 |
| Raleigh and Western Railway | 6 | |
| Randsburg Railroad | 6 | |
| Raquette Lake Railway | 4 | 1 |
| Raritan and Delaware Bay Railroad | 21 | |
| Raritan River Railroad | 5 | |
| Reading and Columbia Railroad | 22 | 4 |
| Red Springs and Bowmore Railroad | 4 | |
| Register and Glenville Railroad | 2 | |
| Rensselaer and Saratoga Railroad | 36 | 1 |
| Retner and Kay Fork Railroad | 4 | |
| Reynoldsville and Falls Creek Railroad | 8 | |
| Richmond and Allegheny Railroad | 11 | |
| Richmond and Danville Railroad | 85 | 8 |
| Richmond and Petersburg Railroad | 20 | 1 |
| Richmond, Fredericksburg and Potomac Railroad | 16 | 3 |
| Rio Grande and Eagle Pass Railway | 7 | |
| Rio Grande and Pagosa Springs Railroad | 6 | |
| Rio Grande Junction Railway Company | 7 | 1 |
| Rio Grande Railroad | 7 | |
| Rio Grande Southern Railway | 12 | |
| Rio Grande Western Railway | 10 | 1 |
| Rio Grande, Sierra Madre and Pacific Railway | 6 | |
| Roanoke Valley Railroad | 8 | |
| Roaring Creek and Charleston Railroad | 5 | |
| Rochester and Genesee Valley Railroad | 15 | |
| Rochester and Pittsburgh Railroad | 7 | 1 |
| Rochester and State Line Railroad | 9 | 1 |
| Rock Island and Peoria Railroad | 17 | |
| Rock Port, Langdon and Northern Railway | 5 | |
| Rockaway Valley Railway | 3 | |
| Rockbridge Alum and Goshen Railroad | 1 | |
| Rockford, Rock Island and St Louis Railway | 13 | |
| Rockville Railroad | 7 | |
| Rockwood and Tennessee River Railroad | 8 | |
| Rogue River Valley Railway | 6 | |
| Rome Railroad | 21 | |
| Rome, Watertown and Ogdensburg Railroad | 39 | 1 |
| Ruddock, Bonnet Carre and Northern Railroad | 1 | |
| Rural Valley Railroad | 2 | |
| Rutland and Burlington Railroad | 22 | |
| Rutland and Washington Railroad | 12 | |
| Rutland and Whitehall Railroad | 5 | 1 |
| Rutland Railroad | 17 | 2 |
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