Couldn't say, I never had a Monorail Train built, but, what I do know is that you don't award a construction contract with bids, etc. without specifics. One doesn't even do that with a simple building. Disney has specifications, they need a certain amount of power, a certain amount of passenger capacity, need to fit through the Contemporary with only slight modifications to the building, certain specific safety backups. There is a good chance at this point that much of that is just standard design on any train, but, even the outside appearance has to line up with what Disney wants for design. They may buy off the shelf for a lot of things, but, something as "in your face" as the Monorail system in WDW would be highly specific and accounted for with the original specs. That does create a slower process then say a normal city transit system that can be purchased off the shelf in many ways. But, as I said, I have never ordered one so the details are just speculations on my part, but, it only seems logical that Disney is going to want what they want and yes, that will lengthen the time for production.