Pantograph test run of Aem 940 # 004 and # 002 in multiple traction on the Thurtal line between Sulgen and Erlen, along the pond at Riedt. This dual power electric and diesel locomotives are built by Alstom for the SBB infrastructure, for duty in shunting yards or for heavy track work trains. The overhead system of this line dates from 1928, usually trains are running up to 125 km/h here. For the tests with raised adjacent pantographs, there are speeds up to 132 km/h scheduled (maximum regular velocity of 120 km/h of this vehicle + 10 %).