The rolling stock of the Express 'Sanbe' was converted into a diesel train, and the operating section of those which were starting at and returning to Hamada Station was extended to Iwami Masuda Station (the present-day Masuda Station) from Hamada Station.
「三瓶」を気動車列車化、また浜田駅発着編成の運行区間を石見益田駅（現：益田駅）まで延長する。