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- Guideways being supported on one side for such a suspended monorail (which it really is) are almost unheard of as far as I know.
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You didn't
fully watch that video, did you.... this already exists in a similar variant elsewhere in the world. Even in Japan, where people often crowd into trains at high densities of 5 people per square metre, it is working very well.
^^^ It looks like that from one of the above videos that (unlike standard monorail) switches aren't hard to construct. That's a big plus if this were to be adopted in a more widespread way, not that I push for a widespread use of this. This would also be great for moving stalled vehicles (with, perhaps, smaller maintenance vehicles that could be used to grab onto and tow away a stalled train) to out-of-the-way tracks and/or to a station to let off the passengers. Or trains could swap from one track to the other to skip the stalled train, in ways no different than how this is done on the existing Skytrain. Problem solved.
I can understand that the stations (though the idea is interesting) may create a lot of problems regarding maintenance an accessibility; then let's not build those type of stations. A standard elevated platform with glass windows and doors that open only when the train gets to the station (similar to other places in the world) would work very well. The suspended monorail itself would still be easy to construct.
EDIT:
HERE is a google streetview image of the system in Japan. In this case, it is built in downtown over a narrow 2-lane road. The suspended monorail system in Chiba, Japan is built over many places and is the most extensive in the world. It doesn't seem to do any harm or look out of place with the urban, pedestrian-friendly cityscape.
Here it is again over a 4-lane road, very narrow... there is no way you could fit LRT here. The support poles are pretty small, which is a good thing because they don't take up very much space on the ground. I don't find this to be in any way detrimenting to the design; for pete's sake, this is Japan, a place hit by heavy earthquakes every year, and these apparently small support poles have no problem at all keeping this line elevated and not befallen.
I primarily like suspended monorail/skytrolley for the flexibility. Problems can be overcome in many different ways whether it comes to emergency situations, where to build the line, and how to build the stations.