Compliments of the Monorail Society (those folks know their monorails) here's an interesting comparison of the size of beam used for various monorail systems around the world, showing that the Disneyland system is the smallest and most toy-like and thus is not suitable for mass transit systems needing to move tens of thousands of people per day.
And because the Disneyland system is a non-standard gauge that is very small, no modern manufacturer in the 21st century produces rolling stock to fit it. It likely would be illegal to do so, as I can't imagine how the small scale cabins of the Disneyland monorails could meet ADA laws and modern safety regulations for mass transit.
Thank goodness for Grandfather Clauses!
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The 20 inch beam used at Disneyland is not the only prohibition to simply "expanding" the existing system. There is the issue of rolling stock and its cabin sizes that are dictated by the low overheads of the existing spaghetti bowl of track inside the park, as well as the relatively tight turns taken just south of the existing Downtown Disney stations and north of the station in a S curve around the Indy building.
From a scaling study done by Bob Gurr as he helped design the PeopleMover system comes this clearance schematic. It shows that the Disneyland monorail has a cabin height of only seven feet from floor to outer roof. Which is why the interior is so cramped and taller folks have to duck to get through the doors.
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And finally, just because this makes me laugh, here's the
Kids of The Kingdom in mandatory matching sweater sets giving us a handy visual of just how small the Disneyland Monorail system is compared to humans.
Thanks, Kids!