The trains change gauge on the move and also raise and lower the car bodies’ height and steps below the doors to accommodate the differing heights of the narrow and standard gauge platforms.
Click here to watch a video of the actual gauge change and to see interiors of the trains.
The unique new gauge change equipment was developed in Switzerland by Alstom. Variable-gauge bogies exist elsewhere, but no other can adapt quite as much as this one, making it a world first for Switzerland.
The brand new GoldenPass Express trains, fitted with the variable bogies, offer passengers a non-stop 3hr 15min journey with no need to change trains and to cart luggage from platform to platform halfway through their journey.