Comment

21.09.17

Crossrail: track installation complete

Source: RTM Aug/Sep 17

Chris Enoch, Crossrail’s railway systems project manager, discusses the complexities in the design and installation of the track system on the Elizabeth Line project.

This summer, the Crossrail programme reached another exciting and momentous milestone. Over 50km of brand new track has been installed between Westbourne Park in the west through to Plumstead and Pudding Mill Lane in the east. This completes the tracklaying for the central tunnelled sections and interconnecting open sections of the new Elizabeth Line railway. 

Following an intense period of design and procurement activity, track construction commenced two years ago with 3km of direct fixed track being installed through the 140-year-old Connaught Tunnel. This was a highly manual operation, requiring significant numbers of logistics, concreting and surveying teams. The completion of the temporary railhead at Plumstead, where a diverse fleet of engineering works trains were stabled and serviced, also enabled construction of the standard track slab (STS) to proceed, heading west towards central London. 

STS accounts for over 80% of the track that has been laid on the Crossrail project. It comprises advanced HP rail (manufactured by British Steel in Scunthorpe), a twin-booted sleeper system and fibre-reinforced concrete. Over 63,000 sleepers and 51,419 metres of rail have been installed, along with more than 800 sections of long welded rail (LWR) which were progressively transported by train from Scunthorpe to site in 108 metre lengths. The 465-metre-long concreting train – a dedicated concreting batching plant on rail – was deployed by ATC, the main joint venture contractor delivering the railway systems works on the project, in August 2015. This highly sophisticated train was key to the STS tracklaying works as it blended, pumped and quality-assured its own concrete as it transited through the tunnels under London. At its peak, the concreting train delivered over 350 linear metres in one shift. The dedicated track team worked 24/7, constructing and setting out the track by day and concreting it by night – the train utilised the track that was constructed the previous night to make the next pour. 

More than 3,600 metres of a highly advanced and specialist track form called floating track slab (FTS) has also been laid beneath areas that are particularly sensitive to noise and vibration at the surface, such as the Barbican, with its theatres and recording studios. The FTS comprises a series of extensive rebar cages, some 50 metres in length, constructed within the tunnel. A range of pressure-absorbing bearers sit within the cages, which have been concreted with an incredibly dense, unique concrete from a London batching plant. Concrete was pumped via Bond Street station and a new, dedicated shaft constructed at Hayne Street, near Farringdon. Concrete was pumped down the shaft and laterally along the tunnel to the FTS work faces to distances of up to 1.2km. 

During this year, track construction proceeded from Westbourne Park (near Paddington) heading east to ultimately meet the FTS areas in the centre, near Bond Street. Concrete was sourced from a local batching plant and delivered to the workface via a dedicated concrete shuttle system. 

As the track became progressively complete, it was used by an increasing number of engineering trains to complete other critical works, such as cable (> 1 million metres), fire mains (42km), drainage, overhead line, walkways and platform screen door installation. This dramatically increased the logistical challenges of completing the track work as multiple trades competed for the same access. Regular planning and logistics reviews and utilising state-of-the-art time/chainage tools enabled optimal planning and prioritisation. 

The design and installation of the track system on the Crossrail project has been far more complex than many would, or could, imagine. The team has built a state-of-the-art railway under the heart of London and I’m immensely proud of the 500+ dedicated men and women who have worked towards the creation of the new Elizabeth Line that will serve passengers for decades to come.

FOR MORE INFORMATION

W: www.crossrail.co.uk

Comments

Andrew Gwilt   21/09/2017 at 11:26

Next task is to install new AC 25kv overhead wires and overhead electrification structures so it can power the Class 345's trains once its installed and energised and signalling as well. Then once that's all done and completed. Hopefully the new Crossrail line should be ready to open in late 2018 or early 2019. Which I think December 2019 is kind of a joke. Why not open the Elizabeth Line in June or July 2019.

Ryan   24/09/2017 at 18:52

Do you know better than all the engineers who are involved in testing and signalling then Andrew???

Add your comment

 

related

rail technology magazine tv

more videos >

latest rail news

View all News

rail industry focus

Rail Technology Magazine fuels the Northern Powerhouse with official partnership

21/11/2018Rail Technology Magazine fuels the Northern Powerhouse with official partnership

Cognitive Publishing, the home of leading rai... more >
Towards railway-specific, bearer-independent communication

17/09/2018Towards railway-specific, bearer-independent communication

Freelance transport journalist Lesley Brown&n... more >

editor's comment

23/01/2018Out with the old...

Despite a few disappointing policy announcements, especially for the electrification aficionados amongst us, 2017 was, like Darren Caplan writes on page 20, a year generally marked by positive news for the rail industry. We polished off the iconic Ordsall Chord (p32), hit some solid milestones on Thameslink (p40), progressed on ambitious rolling stock orders (p16), and finally started moving forward on HS2 (p14) ‒ paving the way for a New Year with brand-new infrastructrure to... read more >

last word

Encouraging youngsters to be safe on the railway

Encouraging youngsters to be safe on the railway

This summer, Arriva Group's CrossCountry and the Scout Association joined to launch a new partnership to promote rail safety among young people. Chris Leech MBE, business community manager at the TOC, gives RTM an update on the innovative scheme. Recognising that young people are more likely to take a risk trespassing on railway tracks, C... more > more last word articles >

'the sleepers' daily blog

Williams Rail Review: The end of saying sorry?

05/02/2019Williams Rail Review: The end of saying sorry?

Keith Williams’ ongoing Rail Review presents a golden opportunity to rebuild the industry’s weakened relationship with its users and set it on a better track for the future, argues David Sidebottom, passenger director at Transport Focus. Passengers waiting at stations today are not peering down the line looking for a strategy ... more >
read more blog posts from 'the sleeper' >

interviews

TfN Strategic Transport Plan: not just for transport's sake

22/01/2019TfN Strategic Transport Plan: not just for transport's sake

Peter Molyneux, Transport for the North’s (TfN’s) strategic roads director, has been leading on the development of the seven economic... more >
Exclusive: Midlands Connect and WMRE talk collaboration and investment in the Midlands' railway

22/01/2019Exclusive: Midlands Connect and WMRE talk collaboration and investment in the Midlands' railway

In the jigsaw puzzle of regional transport decision-making, there must be collaboration and compromise. Midlands Connect media lead James Bovill ... more >
Rail Ombudsman interview: RTM sits down with CEO Kevin Grix

20/12/2018Rail Ombudsman interview: RTM sits down with CEO Kevin Grix

In November, the first ever Rail Ombudsman was established in a bid to give passengers a free independent service to allow passengers to claim co... more >
HS2 train race: making the case

20/11/2018HS2 train race: making the case

Bombardier and Hitachi’s commitment to providing the best HS2 rolling stock pitch to the government was signified with the launch of their ... more >