Thanks for the correction. I knew MILW did a bunch of home builds, and knew the Superdomes weren't Budd or ACF, so I guess I assumed. I hadn't realized PS did any domes besides the flat-paned short domes like they did for Santa Fe or Train of Tomorrow.Would like to just offer one correction to your statement....The Milwaukee 'Superdomes', were not 'home builds', but rather built entirely by Pullman-Standard. Milwaukee did some 'home build' single level cars in their shops, but not these cars.By "Superdome" I assume you mean a full length dome. Technically "Superdomes" were Milwaukee's home builds and I think there are a couple of private ones still around. Amtrak's sole remaining dome, the Ocean View, is a Budd full dome (formerly a Great Northern "Great Dome"), and it runs on the Adirondack in the fall (leaf season), north of Albany 3 days a week in each direction. Iowa Pacific also has Budd full domes, running on the Hoosier State now which I think is an ex-Santa Fe "Big Dome", they also run them on their Rio Grande Scenic and Saratoga and North Creek.
The Southern Pacific 'three quarter length' dome lounge cars were 'homebuilds'.... they took some single level cars in their fleet, and added a dome section supplied to them by The Budd Company. The first modern dome cars, like 'Silver Dome' mentioned by the OP, was a homebuild (in the Burlington's shops).