Railroads History 192 Finance 103 Canals 72 Transportation 46 Freight 43 Rates 40 more ... Early works to 1850 35 Employees 32 Design and construction 27 Management 27 Surveying 26 Description and travel 23 Railroads and state 22 Commerce 19 Mergers 19 Right of way 17 Taxation 17 Labor unions 15 Location 15 African Americans 14 Locomotives 14 Employment 13 Coal mines and mining 11 Costs 11 Railroad law 11 Coal 10 Coal trade 10 Sources 10 Appropriations and expenditures 9 Public works 9 Railroad companies 9 Railroad stations 9 Strikes and lockouts 9 Electrification 8 Commuting traffic 7 Equipment and supplies 7 Roads 7 Cars 6 Crossings 6 less ...