Hay Station Signal Box is a Midland Railway company design. It is a two storey structure of all-timber construction under a hipped slated roof, with an external wooden access stairway at the south end. The box has been demolished.

Sources include: The Signalling Study Group, The Signal Box - A Pictorial History and Guide to Designs, OPC, 1986.

B.A.Malaws, RCAHMW, 23 February 2018.