DB developed the V51 series in 1968 joint with V52 series to provide a number of modern diesel locomotives for narrow-gauge railways. The V 51 series was designed for a 750mm trackgauge, while the V 52 series was designed for a 1000mm trackgauge. The V 51901 went to the RüKB on the island of Rügen and it's still in service to this day.

LGB No. 22512 is a model of the V 51901.
Equipped with a Massoth XL decoder, 2 powerful Bühler engines and a soundmodule this a highly valued locomotive. Which is often used to tow longer freight trains on my track.

The Schoema CFL-150 DH is a popular light shunting locomotive for industrial areas. Schoema specializes in shunting locomotives and still builds them.

Even a garden railroad cannot work without such locomotives.
This model is equipped with a Massoth LS decoder and Heyn/Fertig decouplers to function optimally as a switcher, but is also used from time to time to move around some light wagons.