Thomas the Tank Engine & Friends Season 19 Episode 16 Best Engine Ever Episode Title:Best Engine Ever.Episode Description:Emily sometimes wishes she was as special as Caitlin. She even thinks of herself being streamlined, but Victor reassures her that Caitlin is just a normal engine under herself. Emily still wants to be as special as Caitlin no matter what the other engines say. But one day, she delivers a delivery to Ulfstead Castle, and there she meets Caitlin, who is having a check on herself by her driver. Emily goes back down again from the castle, but all the sudden she hears Caitlin screaming for help; and she is thundering at high speed down the hill right behind Emily with broken brakes, so she cannot stop herself. Emily takes action, and decides to slow down her own speed. Eventually, she stops Caitlin at the bottom of the hill, and Caitlin says that she is her hero. Emily then helps Caitlin to the Steamworks, and this time it was her that needed to help Caitlin, then Caitlin helping her. They laugh together after saying things about the differences between the 2.