Railroads History 67 Finance 61 Canals 51 Early works to 1850 27 Transportation 16 Rates 15 more ... Surveying 15 Design and construction 13 Taxation 13 Right of way 12 Coal mines and mining 11 Freight 11 Costs 10 Description and travel 10 Management 10 Appropriations and expenditures 9 Coal trade 9 Commerce 9 Location 8 Mergers 8 Railroad law 8 Coal 7 Railroad stations 7 Crossings 6 Buildings, structures, etc 5 Law and legislation 5 Public works 5 Railroads and state 5 Street-railroads 5 Competition, Unfair 4 Electrification 4 Maintenance and repair 4 Mines and mineral resources 4 Paper industry 4 Papermaking 4 Pollution 4 Railroad companies 4 Railroad mortgages 4 Water 4 less ...