A Garratt Locomotive No. 485, Series 451-458, with a one meter track gauge and the wheel arrangement 2-8-2 + 2-8-2, which was made in Germany by the firm Henchel & Sohn, and put in service by the State Railway of Thailand between 1929-1936, as seen from its abbreviated name on the side, that is r. f. th. (ร.ฟ.ท.).