Here in a sleepy village in England we reckon we have the longest Disney toy monorail layout in the world, I estimate that there is the track length is somewhere around 300ft. We have a fleet of 9 monorails, including MKVII Red, Orange and Blue. We also have specially made supports that enable monorail track to be placed on top of lego blocks and duel beam supports so that only one pylon is needed to carry two beams.
Here are some videos of our layouts, including On Ride POV and a look at our MKVII monorails, Enjoy
Longest Track: Wolrd's Largest Disney Monorail Route 2 - YouTube
Outside Track: Outdoor Disneyland Red, Blue, and Orange Monorails - YouTube
Out MKVII’s: Red, Blue, And Orange monorails - YouTube