The Gotthard basis tunnel, being built under the famous Gotthard Pass through the Swiss Alps. They’re saying this new double tunnel for trains is the longest in the world, at 57 km. Wonderful ZDF heute journal report on the testing currently underway, showing how Swiss engineers are verifying human/computer interaction to control responses to a variety of simulated emergency situations. It’s not yet known whether the air each train pushes in front of it and pulls behind it will be enough ventilation for all 57 kilometers.
Passenger trains are to travel through the new tunnel at up to 250 km/h. Accelerating inside the tunnel would cost a lot of energy because of the column of air; the F.A.Z. said the trains will “thunder into” the tunnel entrances.
(GOTT haht BOZZ iss TOON ell.)