If you can help, thanks!
The other SP narrow gauges were not "Slim Princesses"
Narrow Gauge & Short Line Gazette, March/April 1992 page 44
Southern Pacific narrow gauge "A" frame hopper car
Narrow Gauge & Short Line Gazette, November/December 1993 page 87
Southern Pacific narrow gauge combine #400
Narrow Gauge & Short Line Gazette, July/August 1993 page 23