Rumbling rails! Ben has gone off the rails and Bill needs help to pull him back up. Percy pulls Ben to safety and realizes that he doesnt need a lucky charm to .\rbr\rbrSeason 17 Episode 14 - After Percy suffers a bout of bad luck, Stephen gives him a lucky charm.\rbr\rbrTwo little engines, best of friends! One is blue, the other green, part of the really useful team! Sing along with Thomas, Percy, and the rest of their engine friends!\rbr\rbrCheck out the best of Percy, the No. 6 green engine! He is Thomas best friend and his favorite job is delivering the mail. Watch videos starring your favorite .