This listing is for a Märklin H.O. ST800 DB 3 Unit Rail Car in the original box (box label is missing). This version has the flat drive shaft which indicates it was manufactured in the early 1950s for use with Märklin 3 rail track - A.C. System in Analog Mode.
It has been tested and it runs, and reverses properly.
Please see the pictures to determine actual condition. Send an email if you would like additional information.