Railroads 1,134 History 457 Street-railroads 145 Description and travel 144 Finance 114 Transportation 101 Canals 95 more ... Underground Railroad 87 African Americans 72 Railroads and state 59 Fugitive slaves 56 Antislavery movements 47 Rates 45 Freight 44 Streets 41 Locomotives 39 Employees 38 Design and construction 37 Coal 36 Early works to 1850 36 Slavery 36 Railroad law 35 Histoire 30 Management 30 Railroad stations 30 Abolitionists 28 Commerce 28 Surveying 27 Electric railroads 25 Railroad mortgages 25 Pacific railroads 23 Employment 22 Railroad companies 21 Railroad 20 Cars 19 Coal mines and mining 19 Mergers 19 Taxation 19 Background 18 Economic conditions 18 less ...