Both the super 381 and Brute are prototypes rejected by Lionel in the pre war period. Both still exist today. Both engines are big for Standard Gauge. The super 381 goes well with regular State Cars. The Brute was grossly oversized for regular State cars so MTH made showroom cars which are blown up versions of State cars.
I run the super 381 on my home layout with a few clearance modifications. The Brute will run with these same modifications.
I believe there are SGMA videos on You Tube showing the Black version from LCCA running at Trainfest 2014 or 2015.