Locations/Dduallt to Tanygrisiau
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| Before | Dduallt |
| Beyond | Tanygrisiau |
In order to have all the connected Deviation points within one section, this page actually begins at Dduallt Manor
Dduallt Manor House
Campbell's Platform
Bunny’s Crossing
Dduallt Farm Curve
Tro Peudy (Cowhouse curve)
Rhoslyn Cutting
Rhoslyn Bridge (Under)
Rhoslyn Cottage
[edit] Dduallt station
Gradient Post 120/86 – Starting point of the Deviation (Site 1).
Gradient Post 80/120 – located at 9 miles 60 chains from Porthmadog
Water Culvert Pipe
Orientation Table (centre of Spiral)
Deviation
Sites -1 to 4
Deviation Site -1
Deviation Site 0
Deviation Site 1
Deviation Site 2
Deviation Site 3
Deviation Site 4
Deviation Stone
Cei a'r Bont (Embankment over the bridge) – named in the original Deviation plans.
Rhoslyn Bridge (Over)
Rhoslyn (Moor Lake) – the mere seen below at the northern end of Dduallt station and behind Rhoslyn Cottage.
The Barn
Barn Site
Sheep Creep No. 1 near the lower end of the Dingle site.
Dingle Site
Coed Dduallt
Milepost 10
Midge Site
Rosary Site
Spooner's Hollow
Dragon Site
Y Dibyn Fach
New Moon Site
Royal Oak Site
Sheep Creep No. 2 provided in Gelliwiog embankment opposite the old footbridge on the 1836 route.
Gelliwiog
Bluebell Site
Two Trees
Culvert 1 – This culvert is under the tunnel construction plant and stone crushing site, referred to by Deviationists as The Football Pitch.
The 1836 Inclines
Old Moelwyn Tunnel
New Moelwyn Tunnel South Portal and Cutting
Gradient Post 120/80 – within tunnel nearer the southern portal.
New Moelwyn Tunnel North Portal and Cutting
Archer's Dam
Culvert 2
Culvert 3
C.E.G.B. Measuring Weir – recording water entering the reservoir from Afon Ystradau.
Milepost 11
Culvert 4
Culvert 5 – A sheep creep on the shore of Llyn Ystradau.
Culvert 6
Moelwyn Inclines
Moelwyn Zinc Mine tramway to site which was worked extensively during the 1914-18 war until the zinc ran out and gave way to slate. This tramway, joined the old FR route near to its junction (near to the former Tunnel Halt and the Tunnel Cottage) with the line from Brooke’s Moel Ystradau quarry – formerly the Syenite Sett Co.’s quarry. From their opening in 1918 to closure in the 1930’s, Brookes’ Ltd transported their output of granite chippings, macadam and setts via the FR Co. to the LNWR yard at Blaenau Ffestiniog using FR owned Ex-German War Dept. wagons.
Llyn Ystradau Straight
Culvert 7
Gradient Post 76/120
Llyn Ystradau (Lake of the valleys) Site of temporary station 1977-78
Buarth Melyn (Yellow farm) An area just south of the power station, with level crossing
Culvert 8
Gradient Post 197/76
Ffestiniog Power Station – Hydro-Electric Pumped Storage System. The Power Station was opened on 10th August 1963 by H.M. The Queen. The Power station can be brought from idle to full load of 360 megawatts in less than a minute. Behind the Power Station, at the intermediate summit, the railway, on longer sleepers, with additional longitudinal guard rails, is carried over four separate bridges, one for each of the four high pressure Penstock water pipes linking the power station with Llyn Stwlan.
Gradient Post 78/197 – Power Station Summit - between this point and the upper end of Tanygrisiau Station (next gradient post above), the up gradient of 1 in 197 (in the Blaenau Ffestiniog direction) becomes a down gradient of 1 in 78.
Summit Cutting
Culvert 9
Culvert 10
Valve House Road Automated Crossing – also called Portal or Penstocks Crossing.
Tanygrisiau Reservoir (created by damming the Afon Ystradau near the village of Tanygrisiau and fed at its north-eastern end by Afon Cwmorthin and at its south-western end by the Afon Ystradau flowing through Nant Ystradau from Moel Ystradau). The reservoir covers an area of 96 acres and the water level can rise and fall by up to eighteen feet in typical daily operation (using 2,000,000 cubic metres of water).
Access Road – the original FR 1836 route is now the access road to the Ffestiniog Power Station built 1963.
Culvert 11
Snowdonia National Park Boundary
Site of the Wrysgan Quarry Incline 1850’s to 1946.
Stwlan Dam Road Automated Crossing
Bryn Elltyd
Pressurised water pipes under the tracks, taking water to the new and very small SWALEC / Welsh Water, Cwmorthin Hydro-electric power station.
Milepost 12
Power Station Information Centre
Afon Cwmorthin waterfall (on the left going towards Blaenau) and bridge – below the bridge, the Afon Cwmorthin flows into the Tanygrisiau reservoir, the outfall from which enters the Afon Goedol.
[edit] Tanygrisiau station
Station opened in March 1866, closed 15th September 1939. The new station opened to passenger traffic on 24th June 1978 and was the passenger terminus until 25th May 1982. Tanygrisiau is at a height of 640ft. and a distance of 12 miles 10 chains from Porthmadog. The station signal box was built in stone by volunteers and completed during 1993. The platform shelter to a traditional design was erected in 1996.
Gradient Post 148/78 – Upper end of the Deviation – The down gradient of 1 in 78 from the Power Station summit becomes an up gradient of 1 in 148 (in the Blaenau direction).
Source: Compiled from the original FR Heritage Chronology, available from the [FRHG] and used here with permission
