Llanfair Caereinion signal box is at Llanfair Caereinion station (nprn 404331), western terminus of the Welshpool and Llanfair Light Railway (nprn 43037). Dating from 1967, the signal box was a one-and-a-half storey brick building under a pitched slated roof, with a Dutton & Co. lever-frame from Llanbrynmair. It was rebuilt on the same site in 2002 in the style of a Dutton box, of brick-to-floor construction with a weatherboarded upper floor under a pitched roof. There is an external wooden access stairway at the south end. The Dutton frame is believed to have 17 levers, with tappet locking, and is currently in use.

Sources include: Peter Kay, Signalling Atlas and Signal Box Directory (Third Edition), Signalling Record Society, Wallasey, 2010, p.67. 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, 02 December 2016.