Permissible storage-battery locomotive can gather and haul coal essentially as cheaply as cable-reel locomotive and it also is decidedly safer to operate than trolley locomotive or cable-reel or non-permissible storage-battery gathering locomotive; operation of mines with storage-battery power is not claimed to be entirely safe under all conditions, such as mistreatment of equipment and use of non-permissible units.
Hauling coal safely with permissible storage-battery locomotives
U. S. Bur. Mines -- Report Investigations
1930
18 pages
Report
English
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