Railroads 40 Street-railroads 38 History 21 Streets 20 Local transit 9 Street railroads 8 African Americans 7 more ... Electric railroads 7 Underground Railroad 7 Transportation 6 Buildings, structures, etc 5 Bus lines 5 Cars 5 Appropriations and expenditures 4 Abolitionists 3 Buildings 3 Civil rights 3 Commerce 3 Commuting traffic 3 Finance 3 Fugitive slaves 3 Histoire 3 Piers & wharves 3 Race relations 3 Railroad stations 3 Segregation in transportation 3 Street railroad stations 3 Subways 3 Transit systems 3 Trolley cars 3 Antislavery movements 2 Buildings and structures 2 Buses 2 Central business districts 2 Coal depots 2 Coal trade 2 Construction 2 Employees 2 Enslaved persons 2 Historic sites 2 less ...