This over and under tunnel set is a greate way to add a lots of fun to your train track layout. Send a train thru the tunnel or attach the two pieces of ascending track and the short adapter piece that come with the set to the top of the tunnel to send a train over it. Manufacturerd out of hardwoods by Maxim Enterprise. Compatible with Thomas the train, Brio, and other fine wooden train sets and accessories. Train not included. Features : Comes complete with two pieces of ascending track, adaptor track and tunnel *Compatible with Thomas and Friends Wooden Railway and Brio and many other fine wooden train sets and accessories *This Over & Under Tunnel is a great way to add lots of fun to your train set Product dimensions : 3.5x9.5x5.25 inches Product weight : 1.15 pounds