The Coleford Branch between Monmouth and Coleford replaced an earlier tramroad. The Monmouth Tramroad, linked Monmouth with Coleford and opened in 1810. It was the first rail transport in the immediate area.

Wikipedia tells us that the “Monmouth Railway Act was a Parliamentary act from 1810 (50 Geo. 3. c. cxxiii) that authorized the construction of a 3 ft 6 in gauge plateway, a type of early tramroad, from mines east of Coleford to May Hill in Monmouth, running through Redbrook. The purpose was to create a toll road for carriers to transport coal and iron ore, but it would not be operated by the company itself. The line opened in stages between 1812 and 1817.” [4]
For just under half a century this was the only ‘railway’ serving Monmouth. This was true for even longer in respect of Coleford.
It is of interest that this line was originally planned to be at the core of a significant network. It had a long tunnel near Newland and is thought to have been the first railway to include a paying passenger service within its Act. [1]
The original tramway bridge (pictured towards the end of this short article) was a low timber girder on stone abutments crossing a minor road serving a couple of farmsteads. This created a large loop up this side valley, which initial plans for the railway involved amputating and replacing with a gently curving viaduct.
Viaducts are expensive, however, and taking a straight course means going a shorter distance and consequently trains would have to climb more steeply. So the viaduct was dropped from the plans and replaced by a huge embankment which made a smaller loop up the side valley. Through this embankment passed the new bridge for the minor road. Although it is a rather large structure (particularly by single arch standards), the top of the arch is still well below the top of the embankment, which carried a minor single track railway. It now carries an overgrown trackbed which is about the same width as the road below. The railway was built to last and, 92 years after the last train to Monmouth from Coleford, the Dog Kennel Bridge remains in excellent condition.






Dog Kennel Bridge carried the Coleford Railway, which ran from Wyesham Junction, near Monmouth, to Coleford, over a minor road between Whitecliff and High Meadow Farm. Construction of the line began in 1880, the contractors being Reed Bros & Co. of London, and it was opened on 1st September 1883. In common with other underbridges on the line, Dog Kennel Bridge is predominantly of stone, but the arch is made of brick. It has massive stone abutments and wing walls. The smaller stone bridge abutments of the Monmouth Railway, which the Coleford Railway replaced, are still visible about 100 metres up the lane (SO 56321007) where the old tramroad crossed the valley on a much sharper curve. [5]



The GWR’s Coleford Branch closed by 1st January 1917, most of the track soon being lifted for the war effort. [5]
References
- https://booksrus.me.uk/gn/page%2096.html, accessed on 4th September 2025.
- https://maps.nls.uk/geo/explore/#zoom=14.8&lat=51.79209&lon=-2.62401&layers=168&b=ESRIWorld&o=100, accessed on 5th September 2025.
- https://maps.nls.uk/geo/explore/#zoom=17.4&lat=51.78774&lon=-2.63287&layers=168&b=ESRIWorld&o=100, accessed on 5th September 2025.
- https://en.m.wikipedia.org/wiki/Monmouth_Railway, accessed on 6th September 2025.
- https://forestofdeanhistory.org.uk/learn-about-the-forest/dog-kennel-bridge, accessed on 6th September 2025.
