Of steam locomotives manufactured by Robert Stephenson and Company, only these four and two Kokutetsu Steam Locomotives Type 400, belonging to Tetsudo Sagyokyoku (a government bureau in charge of the railway) delivered to Taiwan Governor-General Railway, were imported into Japan, and therefore they had rare value.
ロバート・スティーブンソン社製の蒸気機関車は、日本では本形式と台湾総督府鉄道に納入された鉄道作業局国鉄400形蒸気機関車と同形の2両のみで、希少な存在である。