This is the world's most complicated line which is located in Frankfurt,Germany.Inspite of such a complicated line ,we could never hear about any accidents.This is one of the world's busiest railway line.The signals in this lines are fully automated.There is no need for the high speed bullet trains to wait for the level crossings.Hence the mode of transport that is prefered by people in and around Frankfurt is Train.The officials are planning this to extend this kind of system to entire European countries.

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