Hump yard: LAMCUs of cars, wheels moving by camera as box cars roll down incline that will give them the necessary impetus to sort themselves off of the different tracks. LAS from track level of box car heading straight for the camera, then veering off. Shot of man uncoupling cars on the fly. View of same through glass of control tower. Shot of box cars rolling down incline. HA ESTABLISHING PANs of hump yard, not many box cars visible. Various interior shots of M. Tower, men at work directing hump yard. Incidental shots of yard through window.