Railroads 36 Street-railroads 32 Streets 21 History 12 Local transit 9 Street railroads 8 African Americans 7 more ... Bus lines 5 Appropriations and expenditures 4 Buildings, structures, etc 4 Electric railroads 4 Transportation 4 Civil rights 3 Finance 3 Piers & wharves 3 Race relations 3 Railroad stations 3 Segregation in transportation 3 Street railroad stations 3 Subways 3 Transit systems 3 Underground Railroad 3 Underground railroad 3 Abolitionists 2 Buildings and structures 2 Buses 2 Cars 2 Central business districts 2 Coal depots 2 Coal trade 2 Commerce 2 Commuting traffic 2 Construction 2 Employees 2 Fugitive slaves 2 Hist 2 Historic sites 2 Horse railroads 2 Railroad employees 2 Railroads, Elevated 2 less ...