Bachmann Trains Thomas & Friends WHISTLE & CHUFF THOMAS! - HO Scale Ready to Run Electric Train Set Loco w/Analog Sound. With a friendly toot of his whistle, sound-equipped Thomas the Tank Engine™ signals the Troublesome Trucks that it is time to go to work. Our new analog sound Thomas locomotive also features moving eyes plus speed-synchronized chuff and steam exhaust sound upon stopping. As he happily peeps and puffs around the track, everyone can hear that Thomas is a Very Useful Engine! Complete Ready To Run Train Set. Thomas the Tank Engine™ with speed-activated sound and moving eyes. His analog sound system includes whistle, puffs, and steam exhaust upon stopping. 36" Circle of Snap Fit E-Z Track, Power Pack, and Speed Controller. Cars have International Style Hook and Loop Couplers. HO Scale.