The film takes place in the imagination of a schoolboy. As he looks over a railway bridge he thinks of the idea of a school sports day on the railway track. There are four events, all activities which children regularly participate in when trespassing on the railway: breaking the railway fence, last across the tracks in front of a train, throwing stones at a passing train and the Great Tunnel Walk. In the film though, we see the tragic results, including a badly injured driver, the result of a heavy stone shattering his cab windows. The film was horrible, made to shock and be remembered. The controversy it caused was great for bringing the issues to the public eye but it was quickly replaced by "Robbie" in 1979.