CNR hump yard: HAS over CN hump yard in Montreal, box cars being shunted. ZOOM IN, ZOOM OUT with shots of control panel of a tower, hand of operator in extreme foreground. FOLLOW HAS of box cars moving by themselves on network of tracks. Vertical HASs from top of box car of tracks, box car hitch. HASs of camera box car coupling with another box car. Ground shot of man uncoupling two box cars on the move, of box cars coupling, moving past camera. Shots of man greasing journal boxes as box cars move by. LAS of cars moving by camera, diesel shunter. LASs of cars coasting down incline.