Bentley versus steam train race, March 1930

"Babe Barnato gaining with his Bentley versus the Blue Train in March 1930."  A reference to Joel Woolf Barnato (27 September 1895 – 27 July 1948), and his races against the Train Bleu in France between Calais and the French Riviera in the early 1930s. The illustration on the stamp looks like a railcar.