The former signal box serving Hendurnpike level crossing, where the Penrhyn Railway crossed the 1803 Capel Curig turnpike road, is a small wooden shed, painted green and with a slated roof, standing on a raised platform edged with sawn slate blocks. The road has been realigned and widened, erasing all features of the level crossing which was some 25 metres north of the signal box. The railway was constructed in 1800-1801 and closed in July 1962, at which time the crossing was still guarded by white-painted wooden gates. One of the railway's only two signal posts was located next to the signal box.
W J Crompton, RCAHMW, 5 November 2009.