Railroads 1,100 History 316 Street-railroads 134 Finance 111 Canals 82 Transportation 77 Underground Railroad 72 more ... Description and travel 62 Railroads and state 59 African Americans 46 Freight 44 Rates 43 Fugitive slaves 41 Employees 37 Early works to 1850 36 Railroad law 35 Streets 35 Design and construction 34 Antislavery movements 33 Railroad stations 28 Management 27 Locomotives 26 Surveying 26 Railroad mortgages 25 Commerce 24 Pacific railroads 23 Coal 22 Electric railroads 22 Railroad companies 21 Railroad 20 Mergers 19 Slavery 19 Taxation 19 Background 18 Cars 18 Railroad bridges 18 Right of way 17 Abolitionists 16 Employment 16 Location 16 less ...