General commentary; changes have been greater in mechanical haulage than in hand tramming; first step toward mechanical haulage is frequently use of small electric storage battery locomotive for hauling 1-ton cars coupled together with chain links; in details of locomotive construction there have been many changes; size of cars has increased; importance of good track.
Changing standards in underground transport
Min Congress J
Mining Congress Journal ; 23 , n 9 ; p 50-51
1937
2 pages
Article (Journal)
English
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