The Mack FCD railbus rolled on St. Louis B-3 rapid transit trucks. The generator was powered by a 220hp Mack engine. Weight was 21 tons, and it offered 45 seats. Coupler and door was located on one side only, allowing operation as a pair.
© ???. Source of this picture is most likely a private photo album. The author would be thankful for hints, which allow correct attribution. The file has been submitted to the Danbury Railway Museum, owner of such railbus, in ~1996.