This expansion uses a 2nd sheet of 4 X 8 (I am using 2" thick foam). It creates a long run around both sheets, with two independent loops inside. Up to four trains can run comfortably, with two well-matched for speed on the outside route if using LC+ or some other command control.
It also adds a Wye, and an O-72 "Y" turnout, a 90-degree crossing, and a return loop, so this addition adds a lot of fun.
The addition includes an optional access hatch, which I anticipate as a hill/mountain made of 2" foam layers, that is light enough to just lift up vertically. The access hatch also provides access to some great photo shots of trains on the crossing, switching between 4X8s, and running the long straightaways.
