Railroads History 81 Railroads and state 18 Employees 16 Economic conditions 13 Transportation 12 Management 9 more ... Design and construction 7 Finance 7 Passenger traffic 7 Freight 5 High speed trains 5 Railroad engineering 5 Strikes and lockouts 5 Data processing 4 Electric railroads 4 Employment 4 Information technology 4 Social aspects 4 Technological innovations 4 Abandonment 3 African Americans 3 Capitalists and financiers 3 Communication systems 3 Commuting traffic 3 Economic aspects 3 Feature films 3 Local transit 3 Locomotives 3 Railroad construction workers 3 less ...