- "No more slick tricks or 'oil' tell the Fat Controller!"
Slick Trick! is a magazine story.
Diesel is leaking oil and causing havoc in the yard. Sir Topham Hatt tells Diesel that if he continues to leak oil, he will take him out of service. Soon Diesel starts dripping again. He asks for Thomas' help, who is carrying a load of buckets, spades, fishing nets, and kites. Thomas suggests catching the leaking oil in a bucket. The leaky pipe is quickly repaired and the bucket of oil disposed off, before Sir Topham Hatt returns.
- Diesel's bufferbeam is black in most of the illustrations.