I'd almost say based on the rich/high ranking people derailed train design that for those who could afford or were high ranked enough a fitting car model would look something akin to Captain Nemo's car from the film The League of Extraordinary Gentleman. Or I guess something like the Mac 3 from Speed Racer. The blocky smart car look and why they're so prevalent in the zone is the average citizen car model. I'd also go with 1920s 1930s top line Jaguars or other expensive cars that share the same kind of design. Or even the Batmobile from Batman the Animated show. Heck the Regalia would even fit. At least for the high end.