Railroads 1,270 History 342 Finance 152 Street-railroads 149 Canals 85 Transportation 82 Underground Railroad 80 more ... Description and travel 68 Railroads and state 60 Employees 55 African Americans 49 Railroad stations 49 Freight 44 Rates 43 Fugitive slaves 42 Design and construction 41 Streets 39 Early works to 1850 36 Railroad law 35 Antislavery movements 34 Electric railroads 31 Management 28 Surveying 28 Locomotives 27 Railroad mortgages 26 Commerce 24 Railroad companies 24 Coal 23 Local transit 23 Pacific railroads 23 Employment 21 Railroad 21 Railroad bridges 20 Taxation 20 Cars 19 Labor unions 19 Mergers 19 Railroads, Elevated 19 Slavery 19 Background 18 less ...