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1818-9 Construction of the 7 mile plateway, engineered by John Hodgkinson on a gauge of 3ft 6ins. It extended the Llanvihangel Railway to Monmouth Cap (the name of this location comes from the tavern at this horse-changing point).
1829 the Hereford Railway joined the Grosmont Railway end-on at Monmouth Cap.
1846 the lines were absorbed by the Newport, Abergavenny and Hereford Railway
A circa 360m length of tramroad embankment, running WSW-ENE from SO33142110 to SO33492123, is broken by a bridgeless stream crossing where a culvert is depicted on the Ordnance Survey County Series (Monmouth. IV.13 1881). There are stone sleepers in situ. The site is recorded on RCAHMW aerial photograph 945074/49.