The wheel arrangement is effectively two 0-4-0 locomotives operating back-to-back or face-to-face, with the boiler and cab suspended between the two power units.

Vicinaux du Mayumbe in the Belgian Congo, with twenty locomotives built to a 600 mm (1 ft 11+5⁄8 in) gauge by St Leonard in Belgium.

Based on Livio Dante Porta's work, it included larger cross section tubing, insulation of the boiler and an improved front end.

[3][4] Accordingly, a second Garratt for this railway was built to similar specifications, but with superheating added, in the workshops of Girdlestone Rail in Port Shepstone, South Africa.

In addition to K1 at the Welsh Highland Railway, the industrial Beyer-Garratt William Francis, built in 1937, is preserved at the Bressingham Steam Museum.