Technology, Industry, and Agriculture [J] » Technology, Industry, and Agriculture [J01] » Transportation » Railroads
Description
Permanent roads having a line of rails fixed to ties and laid to gage, usually on a leveled or graded ballasted roadbed and providing a track for freight cars, passenger cars, and other rolling stock. Cars are designed to be drawn by locomotives or sometimes propelled by self-contained motors. (From Webster's 3d) The concept includes the organizational and administrative aspects of railroads as well. MeSH
Hierarchy View
Hierarchy Tree View
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