Railroads 441 History 116 Street-railroads 93 Finance 59 Canals 50 Underground Railroad 32 Early works to 1850 27 more ... Transportation 20 Fugitive slaves 17 Streets 17 African Americans 15 Antislavery movements 15 Rates 15 Surveying 15 Electric railroads 14 Taxation 12 Coal mines and mining 11 Freight 11 Abolitionists 10 Coal trade 9 Commerce 9 Design and construction 9 Histoire 9 Management 9 Railroad stations 9 Right of way 9 Appropriations and expenditures 8 Description and travel 8 Location 8 Railroad law 8 Cars 7 Coal 7 Historic sites 7 Local transit 7 Race relations 7 Buildings, structures, etc 6 Bus lines 6 Costs 6 Law and legislation 6 Street railroads 6 less ...