The train was a westbound heading down the 'Big Hill' into Field. Crew had indeed just taken the train over; I don't know where, maybe Lake Louise, maybe Stephen, which is the station at the top of the hill and can be accessed by a side road off the Trans-Canada.
UP 5953 is wrecked adjacent to the Trans-Canada, between the two spiral tunnels, while the lead unit(s) were at the exit of the lower spiral tunnel.