Clarbeston Road Signal Box is a Great Western Railway type 7c design, built in 1906 when a junction was made with the existing South Wales Railway line (nprn 402096) to Neyland, to extend the GWR main line to Fishguard. The box is a substantial two-storey red-brick structure under a hipped slate roof. There are blue-brick dressings to the four camber-headed locking room windows, quoins and plinth and an external wooden stairway at the western end. Originally mechanically operated, the box now houses an NX panel, installed in 1988.

Sources include: Peter Kay, Signalling Atlas and Signal Box Directory (Third Edition), Signalling Record Society, Wallasey, 2010; Network Rail, Signal Box Register (undated). For further information on the types and designs of signal boxes see: The Signalling Study Group, The Signal Box - A Pictorial History and Guide to Designs, OPC, 1986.

B.A.Malaws, RCAHMW, 25 March 2015.