The simulator java file is available from within here and it is to be executed in either Windows/Linux (or Mac?). More help for that (including an elaborate user-manual) is available in that same page.
A simplified example (4 stations) is available here:
Sample infrastructure zip file (for Barabanki-Gorakhpur) is available here.
Output of sample infrastructure is available here.
Page last updated on 20th April 2020.