黑田長政
The locomotives were of the 2-6-0 wheel arrangement, the driving wheels being 914 mm (3 ft) diameter, and used Stephenson valve gear. Their tenders had two two-axled bogies, with the unofficial names written in large kanji (characters). The lettering style is said to emulate the handwriting style of either Settlement Envoy Kuroda Nagamasa or Secretary Sannai Rokusaburō.