Trains and sci-fi go hand in hand. I remember many years ago, going to a sci-fi convention and running into some train buffs. We spent most of the day talking trains, to the baffled looks of passers-by.
One of those guys is one my best friends, over 30 years later!
As for license plates in general, personalized plates are insanely expensive in my state and you have to pay that really high fee every single year, so they're not that common here.