When I read the book, I imagined it in the 40's or 50's with Dagny in a women's business suit and hat and the men in suits and fedoras and overcoats with trains still being important. I think it should have been approached like Michael Radford's brilliant adaptation of Nineteen Eighty-Four which was kept in the period of the late 40's. However, the makers of the movie(s) of Atlas Shrugged didn't have enough of a budget to work with.
Because Hollywood Leftists would never want this message to get out.