Toad the Brake Van is a 20-ton brake van from the Great Western Railway who was rescued by Douglas at the same time as Oliver and Isabel. In gratitude, he became Douglas' brake van. Unusually among the trucks, he is well-behaved and always has the greatest respect for engines and the orderly running of the railway. He always refers to engines as "Mr", calling Oliver "Mr Oliver" and Douglas "Mr Douglas".
His name comes from the fact that, on the Great Western Railway, brake vans were known by the telegraph code "Toad".