During the following years Heliswiss expanded in Switzerland and formed a network with bases in Belp BE, Samedan GR, Domat Ems GR, Locarno TI, Erstfeld UR, Gampel VS, Gstaad BE and Gruyères FR.
They would take over the Tirano-bound through coaches in Samedan from the St Moritz express train, and then pilot them in diesel operation to Surovas or Bernina Diavolezza, where the Gem 4/4 would be switched to DC electric operation.