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2018
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Why doesn't the pantograph(retractable contact apparatus) on an electrically powered train or tram wear out from rubbing against the overhead wires it touches?
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Why doesn't the pantograph(retractable contact apparatus) on an electrically powered train or tram wear out from rubbing against the overhead wires it touches?
1
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10
9
8
7
6
5
4
3
2
1
0
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