Make your Thomas amp Friends TrackMaster world bigger with the Mail See Inside car pack! Now you can see what is happening inside the cargo cars! Open the See InsideÖ Mail Cars to reveal a complete interior environment with detailed cargo and passengers. It's easy to put a favorite story in motion with Trackmaster playsets and accessories. 2 Mail cars Dimensions 4L x 1.5W x 2.25H each car Ages 3 years ONLY compatible with other Thomas amp Friends Trackmaster vehicles and playsets!