Thomas & Friends Season 20 Episode 19 TitForTat

One day two visitors come to the Island of Sodor to take pictures of interesting engines. At first Bert finds them very polite. They drive their little blue car along the line, racing ahead of him and stop to take pictures as they go past. But they don't bother waving or saying hello and when they drive through a puddle Bert gets splashed with muddy water and decides that they are very rude.