Armorsmith,
Thank you for your suggestions and scale calculations.  Yes, I can make the ties on a tablesaw.  I thought I should check if they were commercially available.
Fortunately, I inherited brass rails with the locomotive, so they are not a problem.
Case

I am looking for railroad ties and rails for a display case for a large scale model with the distance between rails of 2 inches.  I want to make a display case for a Southern locomotive that my uncle built in the 1940s.  I have found someone who will make the wood base and plastic cover.  Now I need to find the ties and rails.  Does anyone know someone who would supply ties and rails?  (Or perhaps supply the whole display case?)  I will install the ties and rails on the wood base.  I am open to suggestions on the best way to install the ties and rails.