Railroads History 228 Finance 142 Canals 77 Employees 51 Transportation 50 Freight 43 more ... Rates 40 Early works to 1850 35 Design and construction 34 Management 29 Description and travel 26 Surveying 26 Railroads and state 22 Commerce 19 Mergers 19 Labor unions 18 Right of way 18 Taxation 17 Locomotives 16 African Americans 15 Location 15 Coal mines and mining 14 Employment 14 Periodicals 14 Commuting traffic 13 Railroad stations 12 Costs 11 Railroad companies 11 Railroad law 11 Coal 10 Coal trade 10 Equipment and supplies 10 Roads 10 Sources 10 Appropriations and expenditures 9 Public works 9 Salaries, pensions, etc 9 Steamboat lines 9 Strikes and lockouts 9 less ...