Troublesome Trucks

The Troublesome Trucks (called Cars, originally called Foolish Freight Cars, in the US narration) are pieces of rolling stock that are nicknamed so because they can be very troublesome, and love to play tricks on the engines.

Bio
The Troublesome Trucks are the rascals of Sir Topham Hatt's railway who take great delight in causing trouble for whichever engine has to pull them.