Vintage HO: 0-4-0 Diesel-Electric  Switcher Locomotive

HO gauge.  Approx. 3-1/2 inches long.  Stamped multi-component assembled metal frame, with black molded plastic body.  Painted blue, but with scratches.  No couplers.  Labeled as "Navy Yard, New York, 51."  Includes electric motor and rubber band drive (no bands).  No manufacturer markings, but this loco may be a 50s vintage Lionel model, as I previously owned a very similar Lionel diesel switcher then.  Used.