Railroads History 212 Finance 142 Canals 75 Employees 50 Transportation 50 Freight 43 more ... Rates 40 Early works to 1850 35 Design and construction 34 Management 28 Surveying 26 Description and travel 25 Railroads and state 22 Commerce 19 Mergers 19 Labor unions 18 Right of way 17 Taxation 17 Location 15 Locomotives 15 African Americans 14 Coal mines and mining 14 Periodicals 14 Employment 13 Costs 11 Railroad companies 11 Railroad law 11 Coal 10 Coal trade 10 Commuting traffic 10 Railroad stations 10 Sources 10 Appropriations and expenditures 9 Equipment and supplies 9 Public works 9 Salaries, pensions, etc 9 Strikes and lockouts 9 Electrification 8 Maintenance and repair 8 less ...