51°42′34″N0°41′35″W / 51.7095°N 0.6931°W / 51.7095; -0.6931 (north portal)
51°36′42″N0°31′27″W / 51.6116°N 0.5241°W / 51.6116; -0.5241 (south portal)
OS grid reference
TQ022913
Status
Under construction
Crosses
Chiltern Hills
Start
West Hyde, Hertfordshire
End
South Heath, Buckinghamshire
Operation
Work begun
13 May 2021
Constructed
2020–present
Opens
2029 (scheduled)
Traffic
High-speed passenger trains
Character
Twin-tube
Technical
Length
16.04 km (9.97 miles)
No. of tracks
2
Track gauge
1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrified
25 kV 50 Hz AC
Operating speed
320 km/h (200 mph)
Width
9.1 metres (30 ft)
Cross passages
40
Chiltern Tunnel
Legend
HS2
to Birmingham Interchange
South Heath
(north portal)
B485
Chesham Road intervention shaft
London-Aylesbury line
Little Missenden shaft
A413
A404
Amersham shaft
A355
Chalfont St Giles shaft
A413
Chalfont St Peter shaft
M25
Buckinghamshire-Hertfordshire border
West Hyde
(south portal)
HS2
to Old Oak Common
The Chiltern Tunnel is a high-speed railway tunnel currently under construction in Buckinghamshire and Hertfordshire, England, and will upon completion carry the High Speed 2 (HS2) railway line under the Chiltern Hills. The twin-bore tunnels, which are 16.04 km (9.97 miles) long,[1] will be the longest on the HS2 line.[2] Each tunnel will also have additional 220 m (720 ft) entry and 135 m (443 ft) exit perforated concrete portals to reduce sudden changes in air pressure and subsequent noise.[3]
A contract for the tunnel's construction was awarded in 2017; preparatory work commenced during the following year. In May 2021, it was announced that excavation had commenced. The boring process, which was largely performed by a pair of tunnel boring machines (TBMs), advanced at an average speed of 15 m (49 ft) per day; both TBMs completed their drives by March 2024.[4]
^"Bouygues Travaux Publics - Project - HS2, High-Speed Rail Line". www.bouygues-tp.com. Retrieved 12 August 2021.
^"Chiltern Tunnel". High Speed 2. Retrieved 4 February 2022.
^"HS2 reveals noise-cancelling Chiltern Tunnel north portal design". HS2 News and Information. Retrieved 3 June 2023.
^Hakimian, Rob (22 March 2024). "HS2's 16km Chilterns tunnelling completed with second TBM breakthrough". New Civil Engineer. Retrieved 23 March 2024.
The ChilternTunnel is a high-speed railway tunnel currently under construction in Buckinghamshire and Hertfordshire, England, and will upon completion...
line. High Speed 2 (HS2) will pass underneath the Chiltern Hills in the Chilterntunnel. This tunnel, the longest under construction on the HS2 route,...
Chiltern Railways (legal name The Chiltern Railway Company Limited) is a British train operating company that has operated the Chiltern Railways franchise...
twin-bore tunnel. The 10-mile (16 km) Chilterntunnels will take three years to dig, using two 2,000-tonne (2,000-long-ton; 2,200-short-ton) tunnel boring...
2023. "ChilternTunnel". High Speed 2. Archived from the original on 4 February 2022. Retrieved 4 February 2022. "Work begins boring first HS2 tunnel under...
longest canal tunnel in the United Kingdom. When completed in the late 2020s, the Chilterntunnel will be the 2nd longest mainline railway tunnel in the UK...
The Chiltern Main Line is a railway line which links London (Marylebone) and Birmingham (Moor Street and Snow Hill) on a 112-mile (180 km) route via High...
Cross Tunnel is a 310-metre-long (340 yd) railway tunnel in Gerrards Cross, Buckinghamshire, on the Chiltern Main Line. The purpose of the tunnel was to...
chalk slurry has also been provisioned for the construction of the Chilterntunnel to the north of the viaduct. During March 2021, construction of the...
the village. High Speed 2 will pass underneath the village in the Chilterntunnel. A ventilation shaft will be constructed near the village, disguised...
filled some parts of the tunnel. Numerous reopening proposals for sections of the GCML have featured Catesby Tunnel. In 2000, Chiltern Railways expressed an...
(DMUs), originally specified by and built for the British Rail Thames and Chiltern Division of Network SouthEast. They were built by BREL York Works between...
Marylebone Up Tunnel Sidings is a stabling point located in Marylebone, London, England. The depot is situated on the Chiltern Main Line and is on the...
the Snow Hill Lines again strained capacity through Snow Hill tunnel, and so Chiltern Railways and the Birmingham Alliance decided to restore the original...
nickname endorsed and made official by final passenger service operator Chiltern Railways). The Class 121 is Britain's longest serving DMU, operating in...
fully open for passengers using Chiltern Railways after refurbishment". RailAdvent. Retrieved 20 June 2021. "Tunnel collapse causes rail chaos". BBC...
Chiltern Railways run two trains per hour from either Snow Hill or Moor Street to London Marylebone calling at Solihull and Leamington Spa. Chiltern Railways...
using Snow Hill is to and from London Marylebone, operated by Chiltern Railways via the Chiltern Main Line. The present Snow Hill station has three platforms...
civil engineering works along the 80 km (50 miles) section between the Chilterntunnel and Long Itchington Wood that EKFB is to build. In late 2019, it was...
is also known as London Marylebone and is the southern terminus of the Chiltern Main Line to Birmingham. An accompanying Underground station is on the...
is a market town and civil parish in Buckinghamshire, England, in the Chiltern Hills, 27 miles (43 km) northwest of central London, 15 miles (24 km) south-east...
Banbury in Oxfordshire, England. The station is operated by Chiltern Railways, on the Chiltern Main Line, and has four platforms in use. Banbury Bridge Street...
at the foot of the Chiltern Hills in Buckinghamshire, England. It is situated at the point where the main road across the Chilterns between London and...
(who operate the station), Chiltern Railways, and West Midlands Metro. The station is set at the mouth of Hockley No 2 Tunnel below the elevation of its...
Wood and Bond Street stations. The station has entrances on Baker Street, Chiltern Street (ticket holders only) and Marylebone Road. Nearby attractions include...
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