Bradford the Brake Van - S20-E5
Other mistake: A rock is floating in mid-air when Thomas goes up Gordon's Hill.
Other mistake: Oliver's arm is too tall to fit under the bridge.
Other mistake: Duck stops at Arlesburgh West Station for 5 seconds, which is not enough time to let passengers board his train.
Other mistake: In the very first shot of Spencer, his coaches aren't textured.
Other mistake: The Rev. W. Awdry is not credited in the title card of the episodes "Mike's Whistle", "Tit for Tat", and "Useful Railway." Only Andrew Brenner's name appears.
Other mistake: In the Family Jr. airing, Davey Moore is not credited for writing the episode; Andrew Brenner is. This mistake was fixed in the UK airing.
Other mistake: Thomas has two side rods when he crashes into the pile of dirt. The duplicated side rod moves even though Thomas' brakes are applied.
Answer: Breakdown trains help the engines back on track.