Robbie proves, despite his injured leg, that he is fit for work. But as the opening of the line approaches, tragedy strikes - and Robbie is faced with the most important decision of his life.
George was only trying to be helpful - but the chaos he caused was, according to Mr Jellicoe, "... the worst thing ever to have happened on any of my stations!".
By 1939 George Grant has realised his ambition to become a station-master. Now it is the turn of his son, Andy, to follow in the family tradition-but with the outbreak of war Andy discovers the world doesn't run on six wheels and go chuff.
With the arrival of a girl evacuee, Andy is much put out. But with the German bombers getting closer, and talk of spies, Andy still finds it exciting living on a railway station.