Photo: James Petts
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Valvehouse crossing (or Penstock Road Crossing) is a private road crossing between Summit Cutting and Stwlan Dam Road Crossing, on the downward gradient towards Tanygrisiau. It is officially known as Penstock Road Crossing.
Originally an Automatic Crossing (AOCL) under a Light Railway Order, in 2015 a new Level Crossing Order came into force and Valvehouse was converted to a standard open crossing and the wigwag signals were removed.
A little further up the road from the crossing and on the left was a construction compound during the building of nearby parts of the Deviation. The official name of the construction base was Glan-y-Llyn. It had a fence around it and a roughly made notice said "Fort Lewis". It was named after/by Bunny Lewis. This was where the site foreman provided by McAlpine was based - a requirement of the C.E.G.B. during the West Side route construction near the power station. There were offices, mess rooms, canteen, stores, locker room, ladies' and gentlemens' toilets, office car etc. Work on the McAlpine contract began in October 1976.  The buildings were all temporary portacabin type and their site is no longer obvious.