Can I run different trains using the 4519 cross track?
From Jasper Janssen: ! Yes, since the cross track is electrically isolated, separate train loops can cross each other. However, a figure eight is only a single loop, and can only have one controller. So, to run trains on separate loops, you ll need two or more cross tracks. From Zhengrong Zang: ! With Mindstorms RCX control, it is possible to run two trains without collision with a single cross track. http://legochina.virtualave.net/MOCs/RCXCrossDualLoops.