Rhiwderin or Rhiwderyn Signal Box (nprn 421061) formerly stood at Rhiwderyn Station on the Brecon & Merthyr Railway line west of Newport. The box is a Saxby & Farmer design, type 12b, and was erected in 1884. Following closure, it was moved to the Caerphilly Railway Centre, then to Henllan Station (nprn 41361) on the Teifi Valley Railway, where the top has been re-erected on a new base. The shell is in use as a small museum and the lever frame is in store at the Gwili Railway.

Sources include: Peter Kay, Signalling Atlas and Signal Box Directory (Third Edition), Signalling Record Society, Wallasey, 2010, pp.57,66; 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, 09 December 2016.