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it is the power line of the train, just like the usual train have the power line in the air.

the reason to this is do to that most of the rail is under ground and to have the power in the air under the ground can be dangerus, the usual pover line over the normal tains can travel up to 1/2 meters or more. so when you are under the ground the power is direkted in another way. this is also a cheaper methode to to so, and as long as you dont ty to phas the line you wont get shoked.

it works like the other trains as a pluss.

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