Here is a powered Marklin 8861 Southern Pacific "Black Widow" F7 A Locomotive
This locomotive features a plastic shell, die cast frame, plastic trucks, motor, fishhook couplers, and metal wheels. This unit comes with a 3-pole mini-club motor that powers both trucks.
Sealed -- still in plastic. Hard to find.
Length about 3 in
Stock photo used. Box may be worn or discolored due to storage but this is new merchandise. Might have old store tags on box
See photo for box design
About Z scale:
Märklin Z Gauge - "the Finest Made"
Connoisseurs appreciate Märklin Z as much as the most inveterate modeler: The charm of these finely constructed gems is best seen in the smallest of space. Because, this scale with all kinds of precision translated into 1:220 scale awaits you with almost unlimited operating enjoyment. It doesn't get any better. (Source: Marklin)
Made in Germany