| Railroad | Records | Links |
|---|
| Totals | 31,855 | 997 |
|---|
| Bachman Valley Railroad of Maryland | 2 | |
| Bainbridge Northern Railway | 6 | |
| Bald Eagle Valley Railroad | 7 | |
| Baltimore and Annapolis Railroad | 14 | 1 |
| Baltimore and Ohio Railroad | 333 | 20 |
| Baltimore and Ohio Southwestern Railroad | 11 | |
| Baltimore and Port Deposit Railroad Company | | 1 |
| Baltimore and Potomac Railroad | 7 | 2 |
| Baltimore and Sparrows Point Railroad | 3 | |
| Baltimore and Susquehanna Railroad | | 1 |
| Baltimore, Chesapeake and Atlantic Railway | 8 | 1 |
| Bangor and Aroostook Railroad | 32 | 1 |
| Bangor and Portland Railway | 4 | 1 |
| Bangor, Old Town and Milford Railroad | 10 | |
| Barclay Railroad | 15 | |
| Bare Rock Railroad | 6 | |
| Barre Railroad | 5 | |
| Bath and Hammondsport Railroad | 10 | |
| Bay of Qunite Railway | 10 | |
| Bay State Street Railway | 12 | |
| Bay Terminal Railroad | 6 | |
| Bayfleld Transfer Railway | 4 | |
| Bear Lake and Eastern Railroad | 5 | |
| Beaver Creek Railroad | 3 | |
| Beaver Dam Railroad | 3 | |
| Beaver Meadow, Tresckow and New Boston Railroad | 6 | |
| Beech Creek Railroad | 7 | |
| Belington and Beaver Creek Railroad | 3 | |
| Bellaire, Zanesville and Cincinnati Railway | 17 | |
| Bellefontaine and Indiana Railroad | 11 | |
| Bellefontaine Railway | 28 | |
| Bellefonte and Snow Shoe Railroad | 7 | |
| Bellefonte Central Railroad | 6 | |
| Belleville and Illinoistown Railroad | 17 | 2 |
| Bellingham Bay and British Columbia Railroad | 5 | |
| Bellingham Bay and Eastern Railroad | 5 | |
| Bells Gap Railroad | 7 | |
| Beloit and Madison Railroad | 15 | |
| Belpre and Cincinnati Railroad | | 1 |
| Belt Railway | 6 | |
| Belvidere and Delaware Railroad | 16 | 4 |
| Bennington and Rutland Railway | | 1 |
| Benwood and Wheeling Connecting Railway | 7 | |
| Berkeley Railroad | 3 | |
| Berlin and Lake Superior Railroad | 8 | |
| Bessemer and Lake Erie Railroad | 22 | |
| Bessemer and Southwestern Railroad | 8 | |
| Big Falls Railway | 3 | |
| Big Stone Gap and Powells Valley Railroad | 5 | |
| Big Stony Railway | 4 | |
| Birmingham and Atlantic Railroad | 11 | |
| Birmingham Southern Railroad | 7 | |
| Bismarck, Washburn and Great Falls Railway | 5 | 1 |
| Black and Cache River Railroad | 10 | |
| Black River and Utica Railroad | 24 | |
| Blackwell, Enid and Southwestern Railway | 7 | |
| Bloomsburg and Sullivan Railroad | 8 | |
| Blossburg and Corning Railroad | 14 | |
| Blue Ridge Railway | 6 | 1 |
| Bodcaw Valley Railroad | 4 | |
| Bodie Railway and Lumber Company | 2 | |
| Boise, Nampa and Owyhee Railway | 7 | |
| Book Cliff Railroad | 2 | |
| Boone, Rockwell City and Northwestern Railway | 4 | |
| Boston and Albany Railroad | 63 | 4 |
| Boston and Lowell Railroad | 36 | 2 |
| Boston and Maine Railroad | 157 | 1 |
| Boston and New York Air Line Railroad | 4 | |
| Boston and New York Central Railroad | 8 | |
| Boston and Providence Railroad | 29 | 4 |
| Boston and Worcester Railroad | 35 | |
| Boston Elevated Railway | 18 | |
| Boston, Clinton and Fitchburg Railroad | 17 | 1 |
| Boston, Concord and Montreal Railroad | 49 | |
| Boston, Hartford and Erie Railroad | 10 | |
| Boston, Hoosac Tunnel and Western Railway | 10 | 3 |
| Boston, Revere Beach and Lynn Railroad | 5 | |
| Bowdon Lithia Springs Short Line Railroad | 6 | |
| Boyne City and Southeastern Railroad | 7 | |
| Bradford and Western Pennsylvania Railroad | 5 | |
| Bradford, Bordell and Kinzua Railway | 8 | |
| Branchvllle and Bowman Railroad | 5 | |
| Bridgton and Saco River Railroad | 11 | |
| Bristol Railroad | 3 | 1 |
| Brockville, Westport and Sault Ste Marie Railway | 12 | |
| Brookfield Railway | 5 | |
| Brooklyn and Rockaway Beach Railroad | 7 | |
| Brooklyn Bath and West End Railroad | 6 | |
| Brooklyn City Railroads | 16 | |
| Brookville Railway | 4 | |
| Brownstone and Middletown Railroad | 4 | |
| Brunswick and Birmingham Railroad | 10 | |
| Brunswick and Western Railroad | 7 | 1 |
| Buckfield Branch Railroad | 8 | |
| Bucksport and Elk River Railroad | 3 | |
| Buffalo and Alleghany Valley Railroad | 13 | |
| Buffalo and Erie Railroad | 8 | |
| Buffalo and Pittsburgh Railroad | 17 | |
| Buffalo and State Line Railroad | 54 | |
| Buffalo and Susquehanna Railroad | 21 | 1 |
| Buffalo Creek Railroad | 7 | |
| Buffalo, Attica and Arcade Railroad | 5 | |
| Buffalo, Bradford and Pittsburgh Railroad | 14 | |
| Buffalo, Corning and New York Railroad | 28 | |
| Buffalo, New York and Philadelphia Railroad | 11 | |
| Buffalo, Rochester and Pittsburgh Railway | 42 | 1 |
| Burlington and Missouri River Railroad | 405 | 6 |
| Burlington and Northwestern Railroad | 6 | |
| Burlington County Railroad | 10 | 1 |
| Burlington Railway | 4 | |
| Burlington, Cedar Rapids and Minnesota Railroad | 6 | |
| Burlington, Cedar Rapids and Northern Railway | 21 | 1 |
| Burnside and Cumberland River Railway | 4 | |
| Bushwick Railroad Company | | 1 |
| Butte, Anaconda and Pacific Railway | 11 | |
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