Penmanshiel Tunnel

Last updated

Penmanshiel Tunnel
Overview
Location Scottish Borders
Coordinates 55°53′47″N2°19′39″W / 55.8965°N 2.3274°W / 55.8965; -2.3274 Coordinates: 55°53′47″N2°19′39″W / 55.8965°N 2.3274°W / 55.8965; -2.3274
StatusDisused (abandoned)
Operation
Opened1846
Closed17 March 1979
Owner North British Railway
London & North Eastern Railway
British Rail
Technical
Line length244 m (267 yd)
No. of tracks 2
Track gauge Standard gauge
Electrified No
Operating speed50 mph (80 km/h)

Penmanshiel Tunnel is a now-disused railway tunnel near Grantshouse, Berwickshire, in the Scottish Borders region of Scotland. It was formerly part of the East Coast Main Line between Berwick-upon-Tweed and Dunbar.

Tunnel An underground passage made for traffic

A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.

Grantshouse village in the United Kingdom

Grantshouse is a small village in Berwickshire in the Scottish Borders of Scotland. It lies on the A1, and its nearest railway stations are Dunbar to the north and Berwick-upon-Tweed to the south.

Berwickshire Historic county in Scotland

Berwickshire is a historic county, registration county and lieutenancy area in the Scottish Borders. It takes its name from Berwick-upon-Tweed, which was part of Scotland at the time of the county's formation, but became part of England in 1482.

Contents

The tunnel was constructed during 1845–46 by the contractors Ross and Mitchell, to a design by John Miller, who was the Engineer to the North British Railway. [1] Upon completion, the tunnel was inspected by the Inspector-General of Railways, Major-General Charles Pasley, on behalf of the Board of Trade. [1]

John Miller (engineer) Scottish civil engineer and Liberal Party politician

John Miller of Leithen FRSE MICE DL was a Scottish civil engineer and Liberal Party politician. Together with Thomas Grainger, he formed the influential engineering firm Grainger and Miller, specialising in railway viaducts.

North British Railway British pre-grouping railway company (1844–1922)

The North British Railway was a British railway company, based in Edinburgh, Scotland. It was established in 1844, with the intention of linking with English railways at Berwick. The line opened in 1846, and from the outset the Company followed a policy of expanding its geographical area, and competing with the Caledonian Railway in particular. In doing so it committed huge sums of money, and in doing so incurred shareholder disapproval that resulted in two chairmen leaving the company.

Charles Pasley British Army officer

General Sir Charles William Pasley (1780–1861) was a British soldier and military engineer who wrote the defining text on the role of the post-American revolution British Empire: An Essay on the Military Policy and Institutions of the British Empire, published in 1810. This text changed how Britons thought their empire should relate to the rest of the world. He warned that Britain could not keep its Empire by its "splendid isolation". Britain would need to fight to gain its empire, and by using the colonies as a resource for soldiers and sailors it grew by an average of 100,000 square miles (260,000 km2) per year between the Battle of Waterloo and the American Civil War. Serving in the Royal Engineers in the Napoleonic Wars, he was Europe's leading demolitions expert and siege warfare specialist.

The tunnel consisted of a single bore, 244 metres (267 yd) long, containing two running lines.

During its 134-year existence, the tunnel was the location of two incidents investigated by HM Railway Inspectorate. The first was in 1949, when a serious fire destroyed two carriages of a south-bound express from Edinburgh. Seven passengers were injured, but there were no deaths. [2]

The second incident occurred on 17 March 1979 when, during improvement works, a length of the tunnel collapsed. Two workmen were killed, and 13 others managed to escape. Later it was determined that the ground was not stable enough to excavate and rebuild the tunnel, so it was sealed up and a new alignment was made for the railway, in a cutting to the west of the hill. [1]

The tunnel was also affected by the August 1948 floods. The damage caused by these floods led to the abandonment of much of the railway network in the south east of Scotland. [3]

August 1948 floods

On 12 August 1948, 6.25 inches (160 mm) of rain fell in the area, the total for the week being 10.5 inches (265 mm). [3] Rain falling on the Lammermuir Hills surged into the Eye Water towards Reston, and the channel could not accommodate all of the water. The flood water then backed up the tunnel and flowed to sea in the opposite direction, towards Cockburnspath. The tunnel was flooded to within 2 ft (600 mm) of the crown of the portal. [4]

Lammermuir Hills Range of hills in southern Scotland

The Lammermuirs are a range of hills in southern Scotland, forming a natural boundary between Lothian and the Borders.

Eye Water river in the United Kingdom

Eye Water is a river in the Scottish Borders, it flows in a general SE direction from its source in the Lammermuir Hills to its estuary at Eyemouth on the east coast of Scotland, having a length of approximately 35 km (22 mi).

Reston, Scottish Borders village in United Kingdom

Reston is a village located in the southeast of Scotland, in Berwickshire, Scottish Borders region. The village lies on the western bank of the Eye Water.

Train fire (1949)

On the evening of 23 June 1949 a fire broke out in the tenth coach of an express passenger train from Edinburgh to King's Cross, about 2 12 miles (4 km) beyond Cockburnspath. The train stopped somewhere near the tunnel, within one and a quarter minutes of the fire starting, but the fire spread rapidly and with such ferocity that, within seconds, the brake-composite carriage was engulfed and the fire had spread to the coach in front. Most passengers escaped by running to the guard's compartment or forwards along the corridor, but some were compelled to break the windows and jump down onto the track. One lady was seriously injured by doing this. [5]

The train crew reacted quickly to the incident. The four coaches behind the two ablaze were uncoupled and pushed back, leaving them isolated up the line. Having drawn forward and uncoupled the two burning vehicles, the driver proceeded with the front eight coaches to Grantshouse station. [5]

The cause of the fire was thought to be a cigarette end or lighted match dropped against a partition in the corridor. This did not explain the reason for its rapid spread. [5]

Despite the severity of the blaze, which reduced the two carriages to their underframes, only seven passengers were injured, with no fatalities. [2]

Tunnel collapse (1979)

Location diagram for Penmanshiel Tunnel, near Grantshouse in Scotland Penmanshiel.png
Location diagram for Penmanshiel Tunnel, near Grantshouse in Scotland

The next significant event to occur at the tunnel led to its abandonment.

Upgrading work

Work was being carried out to increase the internal dimension of the tunnel to allow 8 ft 6 in (2.59 m) high containers to travel through it on intermodal wagons. This was done by lowering the track, in a process involving removing the existing track and ballast, digging out the floor of the tunnel and then laying new track set on a concrete base. [1]

As the tunnel was on a very busy main line, and in order to minimise the disruption to passenger and freight services, it was decided that each of the two tracks through the tunnel would be renewed separately, with trains continuing to run on the adjacent open track.

Work was completed on the "Up" (southbound) track by 10 March 1979, and trains were then transferred to this track by the following day, to allow the "Down" (northbound) track to be modified. [1]

Tunnel collapse

At the time the tunnel collapsed there were a total of fifteen people and five items of plant inside. According to the Railway Inspectorate report, shortly before 3:45 a.m. the duty Railway Works Inspector noticed some small pieces of rock flaking away from the tunnel wall, approximately 90 metres (300 ft) from the southern portal. He decided that it would be wise to shore up the affected piece of the tunnel and was making his way towards the site office to arrange this when he heard the sound of the tunnel collapsing behind him. [1]

It is estimated that approximately 20 metres (66 ft) of the tunnel arch collapsed, with the resultant rock fall filling 30 metres (98 ft) of the tunnel from floor to roof, totally enveloping a dumper truck and a JCB. Thirteen of the people inside the tunnel at the time of the collapse escaped successfully; the dumper truck and JCB operators could not be accounted for, and were killed in the accident.[ citation needed ]

Official report

An official HM Railway Inspectorate report [1] was written by Lieutenant Colonel I.K.A. McNaughton, on 2 August 1983. The report concluded that it was impossible to be certain as to the cause of the collapse as access could not be gained to the collapsed portion of the tunnel.

The report suggested that the collapse was likely to be the result of over-stressing of the natural rock on which the brick arch rings were founded. It was likely to have happened at some time in any event and there was insufficient evidence to say whether or not it had been triggered by the excavation.

Finally the report stated that there were no grounds for finding any individual responsible for the accident. British Rail was charged in the High Court, in Edinburgh, with health and safety offences. It was found guilty and fined £10,000.

Replacement works

After the collapse, it was originally the intention of British Rail to re-open the tunnel by removing the collapsed material and repairing the structure of the tunnel. Once the extent of the collapse became apparent, it was decided that this operation would be too difficult and dangerous, and that a more expedient and cost effective option would be to construct a new alignment for the railway. [1]

This decision resulted in around 1 km (1,100 yd) of existing railway (including the tunnel itself) being abandoned and replaced by a new section of line constructed in open cut, somewhat to the west of the original course. [6] The operation to reopen the railway took five months of round-the-clock working. [6] The portals of the collapsed tunnel were sealed to prevent further access.

The contractor Sir Robert McAlpine & Sons Ltd started work on the new alignment on 7 May 1979, and it was completed on 20 August. [1] [7]

During the closure, some trains from King's Cross terminated at Berwick, with onward services being provided by a fleet of buses, some towing trailers for luggage. The bus service went as far as Dunbar, where a railway shuttle took over between Dunbar and Edinburgh. Other East Coast Mainline InterCity 125 services to Edinburgh were diverted via Newcastle, Carlisle and Carstairs. [7]

Road diversion

As a result of the work to re-align the railway line, it was also necessary to alter the course of the A1 trunk road. A map of the area, showing both the railway and the road diverting to the west is available. [8]

Visible remains

The memorial obelisk above the site of the collapse Penmanshiel Tunnel collapse (monument).jpg
The memorial obelisk above the site of the collapse

Since the tunnel was closed, the landscape has gradually 'returned to nature'. The southern portal has been covered by the hillside, and the only clues to the route of the old line are a dry-stone wall marking the railway boundary, and a disused bridge that used to carry the A1 main road over the line.

Memorial

As the collapsed portion of the tunnel was never excavated, the site became the final resting place of Gordon Turnbull from Gordon 22 miles (35 km) away and Peter Fowler from Eyemouth, who were killed when the tunnel collapsed. A three-sided obelisk was erected over the point where the tunnel collapsed to act as a memorial. One face of the obelisk displays a cross, while each of the other two faces commemorates one of the men killed. [1]

The memorial is adjacent to a road running over the hill and is marked on 1:50,000 and 1:25,000 scale OS maps, at grid ref: NT 797670 . From the maps it is also possible to determine the abandoned section of the A1 road, but the original course of the railway is not visible.

See also

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References

Notes

  1. 1 2 3 4 5 6 7 8 9 10 Report on the Collapse of Penmanshiel Tunnel that occurred on 17th March 1979 by Lt. Col. I.K.A. McNaughton, 2 August 1983, Her Majesty's Stationery Office, London, England.
  2. 1 2 Col. R. J. Walker (1952). "Report on the Fire which occurred in an Express Passenger Train on 14th July 1951 near Huntingdon in the Eastern Region British Railways" (PDF). Ministry of Transport / HMSO . Retrieved 12 July 2007.
  3. 1 2 Thomas (1971)
  4. Nock and Cross (1982) pp 87–88.
  5. 1 2 3 Rolt (1966), pp 264–268
  6. 1 2 Biddle, Gordon (1990). The Railway Surveyors. London: Ian Allan Ltd. and British Rail Property Board. ISBN   0-7110-1954-1.[ page needed ]
  7. 1 2 Nock and Cross (1982) pp 192–193.
  8. http://maps.google.co.uk/maps?ie=UTF8&oe=UTF-8&hl=en&q=&ll=55.88417,-2.305584&spn=0.044481,0.159645&z=13&iwloc=addr&om=1%5B%5D%5B%5D

Sources

Further reading

Photographic resources