It is correct that 863 was never rebuilt, and is in original configuration--with some exception. SEPTA, when they donated the car to RCT&HS, wanted some parts off, such as brake gear.
There is ANOTHER blueliner in original configuration that wasn't converted to a coach by RCT&HS, and it will probably be preserved as such.
All of RCT&HS' cars were purchased directly from SEPTA.
The West Chester RR group got at least one blueliner that may have motors in it, but it hasn't operated in years-- don't know if it's serviceable.
NH&I paid an atrocious amount for the wire train car that they just got recently. It does have a functional control stand that may be of use in push-pull type operations