From the 3rd Rail 2015 announcements today I learned that Golden Gate Depot is offering the Budd Slumbercoach in 2R and 3R. Link To GGD Site
Northern Pacific is conspicuously absent from the roadname list on the GGD reservation form, and I have advised them of that oversight. NP is shown as an available roadname in the 2015-New 3rd Rail brochure.