 Its height is approx 100 ft the Goitre Coed Viaduct was widened in 1862 with another stone bridge of slightly differing design sitting embedded next to the original one, this addition can easily be spotted when passing underneath the viaducts arches on the Taff Trail cycle route 8.This viaduct still exists as the gateway to the Taff Valley for the Cardiff to Merthyr Tydfil railway line.In a recent TV appearance, a Brunel expert put the Goitre Coed Viaduct as the finest example of Brunel's viaducts in Wales.