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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.