This HO scale Cranky the Crane with working crane is compatible with other HO scale Thomas Train sets and accessories. Measures approx. 7.75H Please review all warnings and safety instructions printed on product prior to giving to any child Ages 8 The system uses the E Z Track System and is compatible with all HO electric trains. However, Thomas electric trains use a unique coupling system. NOTE Product is NOT compatible with the Thomas Take Along or Wooden Railway System.