The 206 has indeed been sold, several years ago. I think the SP&S 700 group has it now.

205 still exists but is not in use. Both 205 and 206 are built from former NYC baggage cars and served on the AFT before being bought by UP.

207 and 208 (along with 3 others) were bag-dorm cars in the 6000 series until 1962, when the boiler, water tank, fuel tank, etc. were added for service on the rear end of "City of Everywhere" trains. At that time, they became boiler-bag-dorms and had the 2axle trucks replaced with a 3-axle truck under the boiler/tank end and heavier 2-axle truck under the B end. In the mid-1980's, the cars were gutted and 2 HEP plants installed. Each can handle 8 or 10 cars, depending on the weather and how many domes are in the consists (domes require a LOT more power).

209 is assigned to the Steam Shop and has become a boiler-bag-dorm-HEP car. It can handle the 5 steam support cars plus 2 or 3 more.

There were/are plans to build another power car, to be numbered UPP 2055, to replace the 205.