An engine with a crane on his boiler named Harvey arrives, but the engines think he does not look anything like a normal engine. Harvey becomes reluctant to stay, but has his chance when Percy derails at Bulgy's Bridge.

Cranky must stay up all day and night to keep the docks running, which is why he is cranky all the time. A story by Salty makes him cranky enough to knock down a shed. This forces him to be stuck with Salty, Bill and Ben for the night.

Harold helps Percy deliver his mail, but Percy believes he is under threat. When he reaches a broken signal, he is forced to wait until the signal is fixed. He is even more upset when Harold comes to take his mail onward. Harold decides to take the mail all at once - with disastrous results.