Video: MTH O gauge Premier lin 3GS21B Genset Diesel By Bob Keller | August 17, 2011 | Last updated on February 11, 2021 A solid performer that does a great job of duplicating a popular real-world diesel type in O gauge without breaking the bank. Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates The MTH O gauge GenSet is immaculately detailed from the brake air line on the pilot to the air conditioner on the roof. Share this article Print Facebook