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Aug 1952 - The trolley-line termination and the illuminated danger notice at the north end of the trolley-locomotive system
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Aug 1952 - The trolley-line termination and the illuminated danger notice at the north end of the trolley-locomotive system
["Trolley locomotive installation at Beckermet mine"]
(from Colliery Engineering [August, 1952])
Image Reference: L-00518-03-0065-F08
