Going northwards, beyond Nant Gyhirych the Brecon Forest Tramroad crossed Nant-y-cae (now often called Red Gill), its main tributary, on a timber trestle-bridge, formerly with three spans each 4m long, supported by terminal abutments at the end of
embanked approaches and with intermediate vertical timber posts supported on lower stone abutments flanking the watercourse (7.1: Figs. 75-6, 185-86). Stone for the abutments came from no less than five tiny quarries sited on the various levels of the bridge-works.

Bridge (SN 8898 2064), remains comprise stone abutments and interesting remains of a timber trestle.

Built in the early 1820s probably by the engineer Joseph Jones of Ystradgynlais, and funded by the London Indigo Merchant John Christie (originally from Stirling), as part of the Brecon Forest Tramroad from the Swansea Canal at Cae'r-lan over the uplands of the newly enclosed Fforest Fawr to the Tramroad Wharf near Sennybridge. Published as part of Stephen Hughes, 'The Archaeology of an Early Railway System: The Brecon Forest Tramroads' (RCAHMW, Aberystwyth, 1990).

Stephen R. Hughes, 07.09.2007.