This is a model of a BL&K Business Car built for the President of the railroad. It has two large lounge areas separated by a bathroom.
He used one lounge for visitors, and the other end of the car was private. However, the car was eventually sold by the Pittsburgh & Western to a Colorado tourist RR, who installed facing seats and used it in tourist service. (It would be easy for a new owner to install fancy seats, etc.)
Most of that is conjecture of course, though the BL&K did build a similar car and sold it to the EBT where it still runs as #20. GAL (http://www.thegalline.com/index.html) had a request for a business car like #20, so I volunteered to put it together.
It was an Accucraft J&S coach, with three GAL kits added: the sides (complete with board-and-batten overlay,) some fancy ends with deep side windows, plus those snazzy railings. It’s actually for sale - I already have a Business Car. See http://home.comcast.net/~peter.thornton/kate/html/sales.html