This film features the workhorses that are the train-ferries. These are specially adapted ferry boats capable of taking trains of specialised wagons, allowing them to roll on and roll off at terminals with link-span railheads running right up to the dock side, and connecting into the major rail networks. We see all manner of goods being transported this way as the film illustrates the huge range and volume of bulk trade between the UK and continental Europe, routing between Dover and Dunkirk or Harwich and Zeebrugge up to 10 times a day.