Heavy intermodal train with a double "Re 10/10" traction (Re 4/4 II 11161, Re 6/6 11685 and Re 6/6 11679, Re 4/4 II 11328) on the 2.6 % grade of the Gotthard line above Erstfeld. One "Re 10/10" would be enough here for the heaviest trains, which is limited by the strength of the couplings to 1400 tons. For heavier trains a pusher is needed.