MoPac’s Slumbercoach “Southland” was reportedly turned back to Budd in the 60’s and picked up by the Northern Pacific who renamed it “Loch Tarbert.” Amtrak later picked up the N.P. fleet of Slumbercoaches including “Loch Tarbert,” so I guess this is the closest MoPac came to having any of its passenger cars regularly utilized by Amtrak, indirectly via the N.P.