In October 1899 the Stalybridge, Hyde, Mossley and Dukinfield Tramways and Electricity Board was formed. We have covered this before and that post can be found from the 'Label' section on the right hand side of the page, under S.H.M.D.
Dave took the two pictures in this post and said I've never noticed this before. It seems to be an electricity sub-station, and it appears to have originally been built to service the tramway system.
This got me thinking about how many of these S.H.M.D. sub stations are still about around Hyde... or anything else that bares the initials. If you know of anything let us know please... or any information or memories of S.H.M.D.