[HN Gopher] Why are two wires used in railway overhead equipment?
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       Why are two wires used in railway overhead equipment?
        
       Author : firebaze
       Score  : 23 points
       Date   : 2022-05-14 19:58 UTC (3 hours ago)
        
 (HTM) web link (engineering.stackexchange.com)
 (TXT) w3m dump (engineering.stackexchange.com)
        
       | [deleted]
        
       | ReactiveJelly wrote:
       | Summary: It allows the wire that touches the pantograph to be
       | more flat
        
         | nousermane wrote:
         | Or, more precisely - it allows that wire to be sufficiently
         | flat, while requiring significantly fewer poles compared to
         | just using tension:
         | 
         | https://upload.wikimedia.org/wikipedia/it/7/7a/Loco_E554.png
        
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       (page generated 2022-05-14 23:01 UTC)