Merstham Tunnels
| Merstham Tunnel and Quarry Tunnel | |
| Surrey | |
|---|---|
 Train at the north portal of Merstham Tunnel | |
| Location | |
| Carrying: | Brighton Main Line |
| Location | |
| Grid reference: | TQ290550 |
| Location: | 51°16’48"N, 0°9’6"W |
| Structure | |
| Length: | 2,013 yards / 2,113 yards |
| History | |
| Built 1838-1841 / 1899 | |
| Architect: | John Urpeth Rastrick |
| Information | |
The Merstham Tunnel and the Quarry Tunnel are two neighbouring railway tunnels on the Brighton Main Line between Merstham and Coulsdon in Surrey.
The Merstham Tunnel was the first to be built, with construction commencing in 1838 and being opened on 12 July 1841. Built by the London and Brighton Railway, it formed a key element of the original route between London and Brighton. Nearly sixty years after the Merstham Tunnel's completion, the Quarry Tunnel was built amid tensions between the South Eastern Railway and the London Brighton and South Coast Railway. The Quarry Tunnel bypasses the South Eastern's stations, of Coulsdon South, Merstham and Redhill, and thus has been mostly used by fast trains, while the Merstham Tunnel is used by stopping services instead.
On 24 September 1905, the Merstham Tunnel was the location of the first murder on Britain's railways: that of Mary Sophia Money.
Both tunnels were electrified via the installation of a third rail system by the Southern Railway during 1932, after which the route has been largely used by electric traction. Both tunnels have continued to be used through to the present day.
Merstham Tunnel
The original tunnel through the North Downs was constructed for the London and Brighton Railway, forming a key element for conveying rail traffic between London and Brighton.[1] Before construction could begin, six routes, including two by way of the Merstham Gap, were considered. The selected route, chosen after an formal Parliamentary enquiry, was reportedly unexpected to be successful. Even still, the route was modified somewhat allegedly on the account of objections raised by of local landowners.[1] A surveying platform was completed in August 1838 to assist the construction; it remains in-situ to the present day.[2]
During 1838, work on Merstham Tunnel commenced under the supervision of the engineer John Urpeth Rastrick, and was completed within two years. It was bored through chalk, and featured a total of twelve vertical shafts, up which the spoil was raised to the surface in skips by means of horse-drawn winches.[3] Originally, the tunnel had been intended to have a length of 2,013 yards (1.14 miles), but it was realigned midway though construction, shortening it to 1,830 yards (1.04 miles) long.[4] Leading to the north portal of the tunnel the railway passes through a two-mile cutting, with a depth of 100 feet at the northern entrance to the tunnel.[5] Its construction involved the removal of more than a million cubic yards of chalk.[6]
Brick-lined portals were built at each end of the tunnel. An unusual measure, which was intended to boost the travelling public's perception of its safety, the interior of the tunnel was whitewashed and lit by gas lamps, the latter supplied from a small gas works south of Merstham station. However, this practice was soon abandoned as the large quantities of soot emitted by steam locomotives prevented effective illumination of the tunnel anyway.[1] On 12 July 1841, the Merstham Tunnel was officially opened to traffic.[7] At the time of its completion, it was considered to be an engineering marvel of the era.[1]
Although the tunnel was built by the London and Brighton Railway, it was located on a section of line between Croydon and Redhill that was to be shared with the South Eastern Railway, when they commenced services on their route to Dover in 1842. On 16 July 1844, the South Eastern refunded half of the construction cost of the joint line and took ownership of the section between Purley and Redhill, including the Merstham Tunnel.
On 24 September 1905, Mary Sophia Money was murdered in the Merstham Tunnel, a crime which remained unsolved. The incident is believed to be the first murder on a train anywhere in Britain. When her body was found, marks were discovered on the tunnel wall, indicating that Miss Money had been involved in a violent struggle and had been thrown to her death from a moving train.[1]
On 29 January 1989, a passenger train collided with an out-of-gauge engineering train travelling on the opposite line inside Merstham Tunnel; damage was sustained to the passenger train's traction equipment along with several smashed windows.[8]
Quarry Tunnel
The sharing of the main line caused a great deal of friction between the South Eastern Railway and the London Brighton and South Coast Railway, the successor of the London and Brighton, throughout the 19th century.[1] Eventually, the London Brighton and South Coast Railway gained Parliamentary approval to build its own independent line between Coulsdon North and Earlswood, which bypassed the South Eastern stations of Coulsdon South, Merstham and Redhill. This involved the construction of a second tunnel to the east of the original, and 25 feet above the level of the original.[1] Since both routes form part of the Brighton Main Line, in order to differentiate them the former was called the "Redhill Line", whilst the new line became known as the "Quarry Line".
Quarry Tunnel is 2,113 yards (about 1.2 miles) in length. It was constructed between 1896 and 1899, being formally opened on 8 November 1899.[1] The contractors were Messrs Firbank, and the estimated cost was £85,000.[9] The new tunnel was approached by a 100-foot deep cutting on the north side. Both Quarry Tunnel and the original Merstham Tunnel have been operated through to the twenty-first century; while the former is predominantly used by fast trains, services that stop at Redhill and Merstham have instead continued to use the older Merstham Tunnel.[1]
Electrification
During 1932, the lines through both tunnels, along with the wider route, were electrified via the installation of a third rail system by the Southern Railway.[10]
Outside links
- Detail on the Merstham Railway Tunnel via surreyarchaeology.org.uk
- Images of the Merstham Railway Tunnel via travellingartgallery.com
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Tobin, Olivia (21 July 2020). "The ghastly history of Gatwick Airport train tunnel that leads to Croydon". mylondon.news. https://www.mylondon.news/news/nostalgia/ghastly-history-long-train-tunnel-17769726.
- ↑ "Merstham Tunnel observatory". geograph.org.uk. https://www.geograph.org.uk/photo/5032237. Retrieved 27 July 2020.
- ↑ Whishaw, Francis (1842). The Railways of Great Britain and Ireland. Weale. https://archive.org/details/railwaysgreatbr00whisgoog. p. 273.
- ↑ Turner, John Howard (1978). The London Brighton and South Coast Railway 2 Establishment and Growth. Batsford. ISBN 0-7134-1198-8. p. xii.
- ↑ Turner, John Howard (1977). The London Brighton and South Coast Railway 1 Origins and Formation. Batsford. ISBN 0-7134-0275-X. p. 118.
- ↑ Whishaw 1842, p. 272.
- ↑ Turner 1977, p. 141.
- ↑ "Railway Accident in Merstham Tunnel: A Report on an Accident that Occurred on 29 January 1989". railwaysarchive.co.uk. March 1993. http://www.railwaysarchive.co.uk/docsummary.php?docID=407.
- ↑ Turner, John Howard (1979). The London Brighton and South Coast Railway 3 Completion and Maturity. Batsford. ISBN 0713413891. pp. 117-122.
- ↑ Bonavia 1987, pp. 87-89.
- Bonavia, Michael R. The history of the Southern Railway. London:Unwin Hyman, 1987. ISBN 0-04-385107-X