OK, then look at it this way. Back in the 60s you could buy a Plymouth Fury with a 6 cyl engine. Or you could buy the same car with a 426 Hemi putting out 425 horsepower on the showroom floor.
It had the same doors and windshield and fenders, etc....
They didn't have to go back to the drawing board once the master design was in place.
Same as a train. When the load gets heavier, you just add more engines to the front to pull it with. No need to design new track or engines.
JF has already said the system is scaleable. I am not worried about it.
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