IIRC, it should be, but I'd recommend you wait until someone with more experience on the matter can chime in - I don't own a Rail Driver, as despite how much I want one, it has so far remained entirely outside the limits of my budget.
I have a question regarding Win11 also.
My old Win7 hard drive failed and I now have a new system with Win11.
I have been able to get most things working but I have a favorite that I cannot get working.
Does anyone here use Train Despatcher V3.5 & Track Builder V3.1?
Has anyone been able to get them working in Win11?
Tried all sorts of compatibility options but nothing works.