One is in St. Louis. However, not much info on their web page. There is one in Green Bay- The unit pictured here. What I can find, supposedly demo'd briefly on the NYC. Then less than a year on PRR. To UPRR for a short time, then spent the bulk of it's life on the RI. Also saw reference to one being at IRM. But nothing shows up using their collection search. Boxcab E50