I'll start with one:
Carson & Colorado/Nevada & California/Central Pacific (SP) #5 coach Built by Barney & Smith October 1881
Initially preserved privately by Ward Kimball March 1938 donated to Orange Empire Ry Museum (now Southern California Ray Museum) in 1990
And here is another one:
Nevada & California/Central Pacific (SP) #12 Bag & Mail Carter Bros. 1878
donated to City of Los Angeles 1960 at "Traveltown" in Griffith Park
This car has a complicated back history
1. built as Oregonian Railroad coach #3
2. changed to South Pacific Coast coach #81 June, 1896
3. changed to bag-mail SPC #9 February, 1903
4. changed to Nevada & California (SP) #12 July 1, 1906
5. changed to Central Pacific (SP) #12 in 1912
6. changed to baggage car November 1928
7. later used as bunking facility at Keeler
8. last use as extra (spare) caboose
There are other cars in California. Two complete cars at California State RR Museum. Three car bodies preserved in Alturas by Nevada-California-Oregon RR
Also car bodies at the Nevada County Narrow Gauge Railroad Museum. I'll give others a chance to provide information about these cars.
Brian Norden