Search on: RAILROADS 
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Descriptor English:   Railroads 
Descriptor Spanish:   vías férreas 
Descriptor Portuguese:   Ferrovias 
Synonyms English:   Railroad
Subway
Subways  
Tree Number:   J01.937.690
SP8.473.654.587.477.419.010.100
Definition English:   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. 
Allowable Qualifiers English:  
CL classification EC economics
ES ethics HI history
IS instrumentation LJ legislation & jurisprudence
MT methods ST standards
SN statistics & numerical data  
Record Number:   12326 
Unique Identifier:   D011890 

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