As of today, the vehicle variant switcher works on the new vehicles, except for the ones that have no secondary variants of course.
I have also worked out the script implementation for stations and these vehicles.
The rest of today's work is sirens: I have been researching hard to find out vintage FedSig sirens, and I think I have it narrowed down. The vintage rigs will be running these sirens: The PA20 2B lower pitched, PA20 2E (already in the mod) and then the PA200 siren tones that are also in the Montana Mod.