Available now for Train Sim 2017 are the 40xx series of steel interurban railcars that were constructed for the New Haven Railroad in 1920-1921 by Osgood Bradley of Worcester, Massachusetts.
These are truly wonderful models that will be the perfect match for your backdated New York - New Haven route scenarios, or even just to make the southern end of the Springfield Line look more alive.
You can download the NH motor car and coach set for free in the RailworksAmerica File Library.