Hengoed Viaduct | |
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| Coordinates | 51°38′44.53″N 3°13′25.65″W / 51.6457028°N 3.2237917°W |
| Carries | Taff Vale Extension National Cycle Route 47 |
| Crosses | Rhymney River |
| Locale | Maesycwmmer, Caerphilly, South Wales |
| Other name(s) | Maesycwmmer Viaduct Rhymney Viaduct |
| Owner | Newport, Abergavenny and Hereford Railway Great Western Railway British Railways Railway Paths |
| Heritage status | Reopened: 2000 Grade II* listed |
| Preceded by | Crumlin Viaduct |
| Followed by | Quakers Yard Taff Vale Railway |
| Characteristics | |
| Design | Thomas W. Kennard |
| Material | Stone |
| Total length | 284 yards (260 m) |
| Height | 120 feet (37 m) |
| No. of spans | 16 |
| History | |
| Architect | Charles Liddell |
| Designer | Thomas W. Kennard |
| Engineering design by | Thomas W. Kennard |
| Constructed by | Messrs Rennie and Logan |
| Construction start | 1853 |
| Construction end | 1854 |
| Construction cost | £20,000 |
| Opened | 1854 |
| Inaugurated | 1854 |
| Closed | 1964 |
| Location | |
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Hengoed Viaduct is a disused railway viaduct located above the village of Maesycwmmer, in Caerphilly county borough, South Wales. Grade II* listed, it was originally built to carry the Taff Vale Extension of the Newport, Abergavenny and Hereford Railway (NA&HR) across the Rhymney River, and is now part of National Cycle Route 47.