Glacier Express
In the earliest years of the Glacier Express, electric locomotives were used to haul the Glacier Express on the BVZ and the RhB, but steam locomotives were used on the FO. That changed in 1941-1942, when overhead catenary was installed on the FO, enabling completely electric operation for the full length of the route. However, no through trains were operated between 1943 and 1946, due to World War II.