Preschool kids can unbox hours of exciting railway play with the Thomas & Friends Mystery Color Reveal Pack Case of 2 from Fisher-Price. Kids can unbox and dunk the mystery engine in warm water to reveal who it is! Then discover hidden decorations on the engine by changing the water temperature from warm to icy cold (and back again). Each engine also includes 2x cargo cars and 2x surprise cargo pieces for kids to unwrap, load up, and send racing around with the engine. Compatible with any Thomas & Friends track (sold separately). Ages 3 and up