Railways | Great North Rail Project
Northern delights
We’ve been delivering designs for rail upgrades in the north of England for nearly two decades. Now part of the £1bn Great North Rail Project, the work is stimulating regional and national growth.
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To Scotland Preston
N
Preston and beyond to Manchester
Six fast trains per hour instead of five.
Blackpool
Blackburn
Rochdale
Liverpool to Manchester
Four fast trains per hour instead of two. Journey time reduced by up to 10-15 minutes.
Bolton
Salford Central
Wigan
Manchester Victoria
Earlestown
Manchester Piccadilly
- Roby
- Huyton
Traꢀord Park
Freight Terminal
Ordsall Chord
Liverpool Lime Street
To Manchester Airport
To Stockport
Liverpool
South Parkway
- To Chester
- To Crewe
Electrification scheme Existing electrified track Existing track Roby-Huyton four tracking
North of England rail upgrades
Ordsall Chord (see separate case study)
The Great North Rail Project (GNRP) started life as a modest rail enhancement scheme for routes in and around the city of Manchester and adjacent areas of Cheshire. It has evolved into more than £1bn of improvements covering a much larger part of the north of England to remove bottlenecks and smooth out services through new signalling, telecommunications, power, rolling stock and numerous structural and infrastructure enhancements.
At Manchester Victoria Station, where terminating trains were hogging valuable space, we concluded that extra capacity would be best achieved by allowing trains arriving from Blackpool, Wigan and Liverpool to continue onwards beyond Manchester. This required an extra platform to be built at Rochdale, where the trains would be turned around. Designing in features to easily convert this ‘terminating’ opportunities systematically to identify the best
Due to be delivered by 2022, the Great North Rail Project will bring new opportunities to the north of England by allowing hundreds more trains to run every day with improved connectivity and journey times between towns and cities.
interventions. The tool considers factors such as track geometry, signal sighting, gradient, acceleration, air resistance, ecology and track construction, and allows their capital costs to be compared.
Osiris also presents the business case for our choice of solution in graphical form. It proved extremely popular with our client and was subsequently used on other GNRP projects. Its clarity and transparency gave confidence that the best value solution was being implemented. platform to a through platform saved £2.5M.
To date, we’ve been involved with designing around two thirds of the GNRP, covering traditional railway roles as well as structural engineering, architecture, drainage, town planning, ecology and sustainability.
Osiris – assessment tool of the underworld
Where journey time improvement (JTI) was the main aim, we used Osiris, our in-house assessment tool named after the Egyptian god of the underworld, to validate our solutions. Developed on the GNRP’s Manchester to Preston electrification project, the tool enables us to scrutinise the factors affecting JTI in a single co-ordinated way. It audits all the
On the route between Manchester and Rochdale, Osiris helped us identify that the most critical issue was the structural capacity of bridges and the ability to sustain higher forces from faster trains. At Bolton station, the tool identified that a fifth platform would be the best intervention to achieve the required JTI.
The Ordsall Chord has been a particularly complex project involving design of the world’s first assymetric network arch bridge (see separate case study).
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Delivering journey time improvement
Opportunity
Electrification of the Manchester to Preston railway included:
With rolling stock
Electrification would allow electric trains to run
in the north of England coming to the end of its life, coupled with the need to improve journey times on the 41km route between Manchester
on the route, which are faster, quieter, cheaper to operate and less polluting than diesel trains.
Electric trains need an overhead line electrification (OLE) system, depicted on an engineering drawing called a Major Feeding Diagram (MFD). The diagram shows how current will be drawn from substations and limits the distances it needs to travel. MFDs can undergo many changes over the course of a project, particularly when interconnecting projects, such as on the GNRP, are still evolving.
• Design of three traction switching stations
• Altering Bolton station’s
platform canopy to accommodate the overhead line
• Rebuilding Chorley
station to accommodate new electric trains
• Track replacement,
realignment and
Solution
By being flexible and proactive, we identified where changes in the MFD might occur and planned how best to accommodate them. We also suggested where neutral sections (which prevent the current drawn from different substations interacting) should be located.
and Preston, there was an opportunity to make some significant changes.
new signalling
• Making changes
to the track bed to accommodate electrification
• Early development
of staged signalling solutions to support Farnworth tunnel widening
These, in many cases, were more pertinent to our designs than to interfacing GNRP projects and, identifying these locations, helped maintain design momentum on our project without affecting others. With Network Rail engineers working on MFD designs from Mott MacDonald’s offices, lines of communication were clear and constant.
Our approach also involved strategically identifying where points should be located, so that sections of track could be switched off for maintenance, while key routes remained operational. We also proposed an auto-transformer system on the route. This balanced current flowing in the overhead line with that returning via the track to help control voltage in the OLE system, helping it function more efficiently.
Project
Manchester to Preston electrification
Location
Greater Manchester and Lancashire, England
Outcome
Client
Experience on this type of project allowed us to take more direct design control of MFD development. Our proactive attitude helped identify MFD issues that would otherwise lead to delays and keep the GNRP programme on track.
Network Rail
Expertise
Permanent way, overhead line, civil engineering, traction power distribution, telecommunications signalling design
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- Opportunity
- Outcome
Good neighbours
Removing bottlenecks between Liverpool and Manchester
Imagine encountering a bus stop on a motorway. This is approximately what non-stopping trains had to contend with at a busy junction just before Huyton station, which interrupted the flow of trains between Liverpool and Manchester. Huyton only had two platforms, so fast trains were frequently being held up at the junction due to waiting trains at the station blocking the path.
There were advantages for our client to split the cost of this project across two spending periods. It also maximised the use of railway possessions on the network and limited disruption to passengers. Changes made on the route have improved services between Liverpool and Manchester.
Many of the challenges on the GNRP arise from work carried out on one part of the network having a knock-on effect on another. This impacted where and when ongoing infrastructure improvements, particularly to power supply, could be made. A high degree of co-ordination and excellent lines of communication were needed to keep
Solution
Since it was not feasible to move the junction, nor the station, the track at Huyton was doubled to four with the addition of two new platforms. This meant that stopping trains didn’t need to interact with nonstopping ones and the bottleneck would be removed. Four-tracking had to be continued further west to Roby, where two further platforms also had to be built. Because of the way upgrades elsewhere on the route were planned, the fourth track would not be needed until later, so the project was delivered in two stages. abreast of developments on neighbouring schemes.
Instead of putting our project on hold until decisions were finalised, we were proactive in either pre-empting decisions on interfacing schemes or suggesting options which would work best for us and would also fit our neighbour’s objectives.
We have done this in the spirit of working towards the greater good of the entire GNRP. This practice has helped many of the project’s constituent parts stay on programme and budget, and for the public to feel the benefits of the upgrade sooner.
Project
Huyton to Roby four-tracking
Location
Merseyside, England
Client
Network Rail
Expertise
Permanent way design
Opening opportunities with connected thinking.
Talk to us: [email protected]
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