One day there was an accident in the yard at Farquhar. Thomas said it was Percy's fault. Percy said it wasn't. The quarrel wasn't really serious at first, but as time went on the two engines became crosser and crosser. Percy kept out of Thomas' way as much as he could, until one day he was called out to an emergency. 30.1 Thomas, Percy and the Coal 30.2 The Runaway 30.3 Better Late than Never 30.4 Drip-Tank