Railway retarders being tested - Colour.
This material is filmed in colour.
Down Yard Hump, Tees Marshalling Yard, Thornaby, Teesside.
Various good shots, most close ups, of railway retarders at work as train wheels go over them during the tests. Railway wagons are seen free falling down a slope and being slowed down by retarders. Several shots of the men operating switchboard in control room overlooking the tracks.