The South African Railways Class MB 2-6-6-0 of 1910 was a articulated steam locomotive from the pre-Union era in the Colony of Natal.

Their spent steam is then fed to the larger low-pressure cylinders which drive the front set of coupled wheels.

[1][4] These five locomotives joined the first Mallet in banking service, working heavy coal trains between Estcourt and Highlands on the Natal mainline.

To relieve coupler strain, they were used in three-locomotive trains and, in this manner, were able to haul 750 long tons (762 tonnes) up the one in thirty (3⅓%) gradients on that line.

Their early demise was probably brought forward considerably by the appearance of the Garratt locomotive type on Cape Gauge in 1921.