Line near Calstock

[swcovas]

I had reason to be browsing an OS map of Calstock, Cornwall and happened to notice a short stretch of line running along the River Tamar just to the north-west of the village. I am curious to know what this is.
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Sorry.....should have said just to the north east of the village!!

 

[Cliveblackpool]

There is a passenger mine tram track at Morwellham Quay, N.E. of Calstock, used as part of the attraction there. It follows the R.Tamar for a mile or so, then goes ''deep underground''!! Battery operated.
Hydro elecric power station, using water from the Tavy via the old Tavistock canal & canal tunnel.
http://www.morwellham-quay.co.uk/