Julian I was also wondering about the apparent contrast between "algorithm" and "Miami Beach" but now it's clear!
That's a wonderful model and your son should be really glad and proud for your gift ... I still have a wooden train my grandfather scratch built for me when I was a little kid using grandma rolling pin and it's one of my dearest objects.
Lovely build Julian. Will look great on your son's mantle. Andrea I'm guessing why your granddad used your grandmas rolling pin...probably has the right dinks and dents on it to shape the train.