Launched laboriously in 2018 after a number of delays and problems, the Duplex TGL quickly acquired the dubious reputation of being the “train that shakes”. The CFF reacted by launching a transformation program worth 90 million francs. During a test run for the press, the federal company demonstrated what had changed. The outward journey was made with the old model and the return with the modified train, on the same route.
Reto Liechti, Head of Passenger Production at SBB, talks about a new chapter. “Comfort is taken to a new level,” he assures 20 Minutes.
The first impression
For travelers, however, the first impression is that everything remains the same. Travel times and punctuality should not change. The difference will be felt especially inside the trains. “What will change is that it will be calmer. We will be able to read better, work at our place or drink something,” promises Reto Liechti.
Measurements confirm the positive impressions from the test runs. Lateral accelerations are reduced on average by a good third, or even up to 50%, depending on the measurement position in the vehicle. This is particularly noticeable on bends, when passing switches and even on straight sections. The 20 Minutes journalist was also able to notice a notable difference.
Adaptation of bogies
Technically, the transformation involves a deep intervention on the train bogies. The existing roll compensation is removed and various components are replaced or adapted. The transformation is taking place as part of regular reviews in Switzerland, with the support of railway manufacturer Alstom (which took over the original manufacturer, Bombardier) and other partners. Current operations should not be affected.
In mid-2026, after the operating authorization issued by the Federal Office of Transport, a second train will be converted. From the end of 2026, the gradual transformation of the entire fleet will begin. This process will extend until the early 2030s.
Where does the Duplex TGL run?
The famous trains run in particular on the IC1 line between St. Gallen and Geneva, but also between Geneva and Lucerne, as well as between Basel and Ticino, among others. “They constitute the backbone of SBB mainline traffic,” recalls Reto Liechti. For him, the Duplex TGL is already a special train. “It has always been one of my favorite trains and I am convinced that with this project it will become many other people’s favorite train as well.”
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Flurin Pestalozzi joined the Bern department in April 2025 as an intern.
