2-6-8-0

This type of articulated locomotive is unusual in having different numbers of driving axles in each set, and was only found in the United States of America and Germany.

Great Northern received 35 from Baldwin in 1910, numbered 1950–1984, designated class M-1.

The Erie Railroad briefly had a locomotive of this type numbered 2900, but it was rebuilt to a 2-8-0 in 1916 after only six years.

In Germany, during World War II, Deutsche Reichsbahn started work on a condensing 2-6-8-0 mallet locomotive built by Borsig.

The locomotive would have been the largest on the German rail network, but as it was nearing completion in Borsig Werke it was destroyed in a RAF bombing raid.