A Great Western Railway type 27c signal box of 1904, ex Leaton, Shropshire, with a 21-lever frame of 1907, ex Golds Hill, Staffordshire, now in use at Glyndyfrdwy Station (nprn 41317) on the preserved Llangollen Railway (nprn 416546).
Sources include: Peter Kay, Signalling Atlas and Signal Box Directory (Third Edition), Signalling Record Society, Wallasey, 2010, p.60; 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, 10 March 2015.