asked the Secretary for Mines whether his attention has been called to the private efforts now being made to discover a safe and efficient type of electrical-storage battery locomotive for use in coal mines; and whether the Ministry is taking any official action in the same desirable direction?

I would refer my hon. Friend to the latter part of the answer which I gave on the 1st May to a question by my hon. and learned Friend the Member for York (Sir J. Butcher).