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Electricity transmission through a third rail.

The metro, underground Railway, in Copenhagen receive power from a special electricity rail, beside the run-rails. This power-rail is either on right og left side for the train. There is 750 V direct current in the rails. Third-rail service is verly usual in underground railways (metros). A lot of foreign experiences.

The power-rail change from the one side to the other of the train.

The third rail is covered as anybody cannot touch it.

Current collector for third rails, seems very insignificant.