Thomas the Tank Engine & Friends Season 20 Episode 18 Tit for Tat Episode Title:Tit for Tat.Episode Description:Some visitors come to the island to take photos of engines. They visit the Arlesdale Railway and take pictures of the small engines, but Bert is cross that they will not take pictures of him. As they are driving, they spray Bert with mud and Bert wants to take revenge on them. He devises a plan.