Rock Island's #9006 was shop-built using a PS heavyweight, two diesels of 400hp each and a pair of two-axle power trucks.
A picture of the protoype can be seen here:
RI motor car #9006
As usual (and in this case, prototypically) an Aristo HW was used for the shell & roof (the rest of the HW will be used to stretch another one to prototypical 85' length). Trucks are from an USA-trains NW-2 with several modifications.
