Third rail

  karmgord 18:29 17 Dec 10

How comes the mainline train companies blame third rail technology for failure of service yet the underground use the same systems and their trains run ok on long sections of line overground?

  spider9 18:58 17 Dec 10

Possibly the underground trains run a more frequent service, so rails don't have the same chance of icing up?

On some lines, the rail is covered by a 3 sided box. The underneath is left open and the shoe on the train picks up current from the bottom. Therefore, there's no ice on the surface to worry about. On other lines, either de-icer trains are run to keep the third rail clear or ghost trains are run to try and keep ice at bay.

  QuizMan 08:59 20 Dec 10

Current reason/excuse (delete as appropriate) is that the new overground trains are lighter than the old ones and therefore make less contact with the 3rd rail. Most underground trains are old rolling stock

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