I believe there is still a Budd RDC fleet operating in Canada with VIA Rail.
There are two VIA Rail routes - one active, one suspended - that use the RDCs.
The
VIA Rail Malahat was suspended in 2011. It was a single daily 450 mile round trip from Victoria in the south of Vancouver Island, via Nanaimo, to Courtenay in the north. VIA Rail blamed low passenger numbers, degrading track conditions, and the high cost of maintaining an isolated route away from the mainland when they suspended service. It is now planned to return in 2015, but with an additional morning service from Nanaimo to Victoria and return in the evening, hopefully making it more attractive to commuters.
VIA Rail's only current Budd RDC service is the
Sudbury - White River train (formerly called the Lake Superior) in Ontario. It's an eight hour, 300 mile trip that operates three days a week in each direction. Although the VIA Rail Canadian passes through the city of Sudbury, it stops at Sudbury Junction outside town, and there are no connections between the two trains. The Sudbury - White River RDC is mainly used to reach remote cabins and communities.
There are probably some other heritage routes in the USA that use Budds, but I'm less familiar with them.
As an aside, American and Canadian passenger trains started to move away from the unfinished stainless steel with high speed projects in the seventies and eighties.
Both Amtrak and VIA Rail used the UAC Turbotrain in the seventies and early eighties, and this was painted in white/red (CN) and yellow/blue (VIA) in Canada.
The VIA Rail LRC (a necessarily bilingual acronym for both 'Light, Rapid, Comfortable' and 'Léger, Rapide, et Confortable') was a kind of Canadian Intercity 125 - only with Active Tilt technology. While it was planned to travel at up to 125 mph it was eventually limited to 100 mph.
According to Wikipedia, some of the LRC locomotives last duties included hauling the infamous ex-Nightstar carriages on a short lived overnight Montréal - Toronto sleeper service.
The LRC carriages are still in use today, albeit behind taller, heavier and more powerful GE locomotives, in the VIA Rail Corridor in Québec and Ontario. As you can see, they look a little odd behind a taller loco