Well, you piqued my interest. I just finished speaking with the Meadowcroft site.
Some information:
The car was a private coach that was in excellent condition. The interior had all of the original appointments, sheets, silverware, dishes, etc. 4 cabins, kitchen, bath servant quarters.
The person said it was associated with Union Pacific RR originally.
The car is now in Sacramento with a State Museum.
They didn't have any further specifics.
I forgot to ask how it was transported.