Due to radical changes in coal-mining methods, old standard mine-car designs are becoming obsolete; types are wood, composite, and all-steel car; replacement of swinging door by lifting endgate; tight-end composite car; types for rotary dump; difficult to obtain suitable lumber for car bottoms; examples of all-steel cars; betterment is needed in type of wheels used on cars; mine-transportation methods are passing through same cycle of development as have steam railroads.
Better and bigger cars needed in modern mines
Coal Age
Coal Age ; 35 , n 11
1930
5 pages
7 Figs.
Article (Journal)
English
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