Thompson Canyon Tonnage A heavy eastbound CPKC manifest thunders upgrade along the Thompson River Canyon. The heavy eastbound manifest is set up 3x1 DPU x 1DPU for its assault on the Canadian Pacific's western grades. The train here is on a grade that is more than 1%, the train is filling the canyon with the sounds of prime mover as it crosses a trestle on a treacherous defile along a bench above the river.