| 1 | B&A | Boston & Albany R.R. | 8/1920-10/1966 | | NAKINA |
| 2 | B&A | Boston & Albany R.R. | 7/23-10/66 | | NRHS |
| 3 | B&A | CONSOLIDATED RAIL CORP. [BOSTON & ALBANY RR] | | | PWRC |
| 4 | B&C | Barre & Chelsea R.R. Co. | 7/1923-1/1946 | | NAKINA |
| 5 | B&C | Barre & Chelsea R.R. Co. | 23-Jul | | NRHS |
| 6 | B&C | BARRE & CHELSEA RAILROAD CO. | | | PWRC |
| 7 | B&CW | Bennettsville & Cheraw R.R. Co. | 8/1920-1/1950 | | NAKINA |
| 8 | B&CW | Bennetsville & Cheraw R.R. Co. | 7/23-4/38 | | NRHS |
| 9 | B&CW | BENNETTSVILLE & CHERAW RAILROAD CO. | | | PWRC |
| 10 | B&G | Bingham & Garfield Ry. Co. | 8/1920-7/1936 | | NAKINA |
| 11 | B&G | Bingham & Garfield Ry. Co. | 23-Jul | | NRHS |
| 12 | B&G | BINGHAM & GARFIELD RWY. CO. | | | PWRC |
| 13 | B&LE | Pittsburgh, Bessemer & Lake Erie R.R. (Bessemer & Lake Erie R.R.) | 8/1920-7/1936 | | NAKINA |
| 14 | B&LE | Bessemer & Lake Erie R.R. | 8/1920-10/1966 | | NAKINA |
| 15 | B&LE | Bessemer & Lake Erie R.R. | 7/23-10/66 | | NRHS |
| 16 | B&LE | BESSEMER & LAKE ERIE RAILROAD | | | PWRC |
| 17 | B&M | Boston and Maine R.R. | 8/1920-7/1936 | | NAKINA |
| 18 | B&M | Boston and Maine R.R. | 23-Jul | | NRHS |
| 19 | B&M | *BOSTON & MAINE CORP. | | | PWRC |
| 20 | B&M | *BROWNSTONE & MIDDLETOWN RAILROAD | | | PWRC |
| 21 | B&O | Baltimore & Ohio R.R. Co. | 4/1938-10/1966 | | NAKINA |
| 22 | B&O | Baltimore & Ohio R.R. Co. | 4/38-10/66 | | NRHS |
| 23 | B&O | CSX TRANSPORTATION, INC. [BALTIMORE & OHIO RR] | | | PWRC |
| 24 | B&S | Baltimore & Ohio R.R. | 4/1938-1/1946 | | NAKINA |
| 25 | B&S | Buffalo & Susquehanna R.R. Corp. (Baltimore & Ohio R.R.) | 7/1932-7/1936 | | NAKINA |
| 26 | B&S | Buffalo & Susquehanna R.R. Corp. | 7/1923-7/1930 | | NAKINA |
| 27 | B&S | Buffalo & Susquehanna R.R. Corp. | 23-Jul | | NRHS |
| 28 | B&S | Baltimore & Ohio R.R. | Apr-38 | | NRHS |
| 29 | B&S | Bahn&Service | Walburg | D | privat-bahn.de |
| 30 | B&S | BUFFALO & SUSQUEHANNA RAILROAD [BALTIMORE & OHIO RR] | | | PWRC |
| 31 | B&SE | Birmingham & Southeastern R.R. | 4/1938-7/1965 | | NAKINA |
| 32 | B&SE | Birmingham & Southeastern R.R. | 4/38-7/65 | | NRHS |
| 33 | B&SE | BIRMINGHAM & SOUTHEASTERN RAILROAD | | | PWRC |
