Before the SDP 40F's came, the SUNSET was powered by a UP E unit, th 3 B&O E's. All A units!
Dominic, please,,,,,they are discussing the hi-level El Capitan on the Santa FE, i.e NOT the Sunset on the SP!!! I'll bet none of the Santa Fe modelers on here give a rats *** about what the SP, nor the UP did, in my opinion.
This was the early Amtrak SUNSET, which did use the ex ATSF high level coaches, both the regular and step up cars. One of those early Amtrak rainbow train.
The set is coming out in Amtrak, so this train could be modeled.