It was in 1909 well after three years since the acquisition had started that, including the model number of train cars that had been used in the former Imperial Government Railway of Japan, the new model numbers were set up.
旧鉄道作業局の車両を含めて、新たな形式番号体系が制定されるのは、買収開始から実に3年後の1909年のことである。