Comment un train change de voie ?

How does a train change lanes? And yes, it is more complicated than it seems because between the rigid rail and the train without a flywheel, it poses some questions: How does the train run? What is the role of the driver in the direction of the train? Why is there a steering wheel if it doesn't turn the wheels? What is a referral? How does a referral work? ... And lots of questions around all that :) 00:00 Intro 00:37 The wheel without flywheel 03:30 Referrals 08:07 Driver's role in the directions 12:27 Trivia My twitter:   / philippe_peray