Railroads 43 Street-railroads 40 History 24 Streets 20 Local transit 10 African Americans 8 Electric railroads 8 more ... Street railroads 8 Underground Railroad 8 Buildings, structures, etc 6 Cars 6 Transportation 6 Bus lines 5 Abolitionists 4 Appropriations and expenditures 4 Buildings 4 Commuting traffic 4 Fugitive slaves 4 Race relations 4 Railroad stations 4 Subways 4 Trolley cars 4 Central business districts 3 Civil rights 3 Commerce 3 Enslaved persons 3 Finance 3 Histoire 3 Historic sites 3 Piers & wharves 3 Segregation in transportation 3 Slavery 3 Street railroad stations 3 Transit systems 3 Trolley buses 3 Antislavery movements 2 Buildings and structures 2 Buses 2 Cable cars (Streetcars) 2 Coal depots 2 less ...