History Railroads Transportation 15 Sources 10 Finance 9 Canals 7 Employees 6 more ... Locomotives 6 Periodicals 6 Businessmen 5 Histoire 5 Labor unions 5 Pacific railroads 5 Buildings, structures, etc 4 Description and travel 4 Railroad companies 4 Biography 3 Chemins de fer 3 Coal mines and mining 3 Commerce 3 Lumbering 3 Railroad stations 3 Railroads, Gravity 3 Social aspects 3 Social conditions 3 African Americans 2 Archives 2 Aspect social 2 Branch lines 2 Capitalists and financiers 2 Coal miners 2 Discrimination in employment 2 Early projects 2 Electrification 2 Employment 2 Iron industry and trade 2 Labor movement 2 Race discrimination 2 Right of way 2 Spoorwegen 2 less ...