It is an ex-D&RG car that was obtained in the 1970's at the start of the restoration group's passenger operations. I think it was orginally a gondola - Jim can confirm that. 4 cars were obtained with 2 being rebuilt for passenger service and 2 kept for parts.
They were rebuilt with a roof and open windows as rider cars and had their roofs replaced in 1990. One has since been sold to the Georgetown Loop. the remaoning car had the removable windows and a wood stove added about 5 years ago. It was recently resided and painted in pullman green to match the other passenger cars.