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Ystrad Mynach South Signal Box

A Grade II Listed Building in Ystrad Mynach, Caerphilly

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Latitude: 51.6354 / 51°38'7"N

Longitude: -3.2445 / 3°14'40"W

OS Eastings: 313968

OS Northings: 193685

OS Grid: ST139936

Mapcode National: GBR HV.82MP

Mapcode Global: VH6DL.Q544

Entry Name: Ystrad Mynach South Signal Box

Listing Date: 27 January 2014

Grade: II

Source: Cadw

Source ID: 87669

Building Class: Transport

Location: To the south of Ystrad Mynach station on the west side of the tracks off a rough lane from Twyn Road. Private property.

County: Caerphilly

Town: Caerphilly

Community: Gelligaer

Community: Gelligaer

Built-Up Area: Ystrad Mynach

Traditional County: Glamorgan

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Built c1890 for the Rhymney ailway by McKenzie and Holland and shown on the 1901 2nd Edition Ordnance Survey Map. Constructed as a Type 3 MaKenzie and Holland Box but with a stone base, as specified by the Rhymney Railway over the normal McKenzie and Holland pactice of using brick and timber for a base. Its siting high on an embankment ovelooking the rail line is a rare survivor of a once-common south Wales practice giving signalmen a clear view in this case of the sweeping line south of Ystrad Mynach station and the junction with the Merthyr branch line. This siting requires the use of an external platform to take the signal wires to ground level. Originally it would have been equipped with a McKenzie and Holland lever frame but removed shortley after inspection in 2013.


Signal Box. Two storey of rock faced stone and timber with hipped corrugated sheet roof with ventilators. East trackside elevation with 2 tall round headed windows with small paned framed glazing to lower floor and timber gallery to the upper floor with continuous glazing of four horizontally sliding slash window. Built against the tackside elevation at low level is a platform supportng two changes in direction of the point rodding and signal wires, diverting them to ground level. Gallery on upper floor returns to north and south, later first floor extension with part galzed door to lever room and access steps to the south, presumably replacing originals. Plain stone rear (west) elevation.


Upper floor retains block shelf, locking levers and track layout plan.

Reasons for Listing

Included for its special architectual interest as a well preserved signal box, a rare surviving example of a McKenzie and Holland type 3 signal box, its design adapted to fit local requirements.

Other nearby listed buildings

  • II Old Fire Station
    Originally situated off Park Road but now resited in grounds of Caerphilly County Borough Council offices at Ystrad Fawr, to W of main house.
  • II War Memorial
    Just off Caerphilly Road in a square to the north of Ysbyty Ystrad Fawr, approx. 50m W of the Old Fire Station (rec no 13569).
  • II Church of Holy Trinity
    A472 skirts the W side of Ystrad centre; church is set back from the road on a knoll within a very hilly walled churchyard which falls away steeply to W and S, main entry at SE through lychgate.
  • II Mill Forge
    On the southern border of Ystrad Mynach, on the W bank of Rhymney River, fronting the thoroughfare.
  • II The Old Mill
    Set slightly back from the main thoroughfare and on the opposite side of Nant Llanbradach from the Forge.
  • II Llanbradach Fawr
    Situated on the mountainside on the W slope of the Rhymney Valley, SW of Ystrad Mynach, and reached by a long lane from Llanbradach to S.
  • II Barn and stable range at Llanbradach Fawr
    Farmyard is on uphill side of the house and this barn is roughly parallel with the house.
  • II Pen-y-waun
    Heol Fawr leads S from Nelson to the open mountain of Mynydd Eglwysilan, the track leading to the farm being about half-way along.

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