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 new locomotives are dual mode, they are both electric and diesel-electric. Under 15kV 16,7 AC catenary these machines will have a maximum power output of 2.000 kW (1.735 kW nominal).
In diesel mode the total power at wheel rim is 900 kW. The Aem 940 has two power packs of which one will be switched off if the requested power is under 450 kW. The SBB ordered 47 of this 84 ton vehicles with 120 km/h maximum velocity.