As described on the Superliner page, the Superliner design was based on that of Santa Fe’s El Capitan cars. As it turned out, representatives from all types of the original El Capitan cars remained in Amtrak service after introduction of the Superliners. These include the transition coaches (“Dorm Coach” in Amtrak parlance) the Parlour Lounges, “standard” coaches, and diner/lounges. *
The dorm coaches were used at the front of trains during Amtrak’s S1 era, but were gradually phased out as the S2 Transition Sleepers entered service in the 1990s, and all are off the roster now. As of this writing, five Pacific Parlour Lounges remain in Amtrak service on the west coast. I also videotaped one in Colorado on 12/29/1994 on train No. 5.
Several of these former El Capitan cars appeared in Alamosa for service and rebuilding in 2015 by the SL&RG, all wearing Phase 3 stripes. I took advantage of this rare opportunity to get some portraits.
*The El Capitan was coach-only, hence no sleepers.