Continued improvement over previous figures; survey shows average reduction of more than 60 per cent accomplished during past eight years; progress in overhead trolley-wire maintenance during last eight years is clearly shown by general decrease in number of breaks.
Low records made in trolley wire breaks
Elec. Ry. Jl
Electric Railway Journal ; 74 , n 1
1930
2 pages
9 Figs.
Article (Journal)
English
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Trolley wire breaks prevented by alert maintenance
Engineering Index Backfile | 1929
|Engineering Index Backfile | 1928
Engineering Index Backfile | 1930