On track: creating a step-change in 21st century railway track
Key details of this case study:
Summary: Our research is creating a step-change in the engineering, economic and environmental performance of railway track to make it fit for a 21st century railway, by developing new design, construction and maintenance techniques.
Status: Completed
Key staff: Professor William Powrie ; Professor John Preston ; Professor David Thompson ; Dr Antonis Zervos
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The challenge
For the past 150 years, the majority of the world’s railways – including all UK main lines – have run on ballasted track. This has been considered an optimum solution in terms of construction cost, stiffness and drainage properties, and ease of modification. However, the introduction of faster, heavier and more frequent trains makes its limitations more significant, resulting in higher than expected maintenance costs.
To reduce cost and increase capacity a transformation in track performance, by using retro-fit measures or an alternative system, is essential.
The University of Southampton’s challenge has been to understand the relationship between engineering, economic and environmental performance of railway track, and to provide the science needed to underpin a radical overhaul in techniques for 21st century railway track design, construction and maintenance.
What we did
We simulated the actual stress experienced by the soil below the track during train passage more closely than the current industry standard test, and showed that increasing train axle loads may cause old embankments to fail.
We then carried out multiple rig tests to reproduce and test a section of railway track; triaxial tests to study the mechanical behaviour of scaled-down ballast; and detailed numerical models involving thousands of individual, interacting ballast particles.
By integrating these results we were able to determine the effect of shoulder geometry, sleeper type, fibre reinforcement and under-sleeper pads on ballast settlement and resilient behaviour, and the stresses within the ballast due to typical traffic loads.
Combining these results with those from critical zone field studies enabled us to understand the extent and likely causes of problems; assess the effectiveness of interventions and component improvements in reducing maintenance needs; and improve numerical modelling techniques.
This research was funded by £3,139,382 EPSRC Programme Grant EP/H044949/1, 1/6/2010
Our impact
This Track21 project is cited as an example of research and development best practice in, and forms the basis of, the UK's Department for Transport Rail Technical Strategy (RTS) to 2040. Similarly, Network Rail's (NR's) Technical Strategy cites Track 21 as an enabler of its infrastructure vision.
Our widely distributed Guide to Track Stiffness (ISBN 9780854329946) is fast becoming the UK’s de facto standard, and we are undertaking further infrastructure work as National Rail's Strategic University Partner.
The results and techniques we developed in Track21 have been used to develop track monitoring equipment for Wessex Rail Alliance, to analyse product performance for Progress Rail UK and to advise London Underground Ltd on novel track forms. Our results have also informed HS2 and our techniques are being used in research for the HS1 track.
The EU Horizon 2020 Shift2Rail call adopted ideas generated by Track21, and we have established overseas partnerships with Railway Technical Research Institutes in Japan and Korea and with Deutsche Bahn and SNCF.
The facilities we used
We used the following facilities within the University - the Railway Testing Facility, the μ-VIS X-ray Imaging Centre and the Geotechnical Lab .
Find out more about the Engineering and Environment Faculty's many world class facilities.
Partners we worked with
We worked closely with external stakeholders: Balfour Beatty Rail, Tata Steel, Network Rail Ltd, Rail Safety and Standards Board (RSSB), Railway Industry Association and URS.
The Track21 research project was an academic collaboration between the universities of Southampton, Birmingham and Nottingham.
Awards received for this research
Mr K Briggs won the Cooling Prize Paper in 2010 with his paper entitled ' Charing Embankment: Climate change impacts on embankment hydrology '.
Dr L Le Pen, Dr D Milne, Professor D Thompson and Professor W Powrie received an Honourable Mention for the Quigley award, for their 2016 article titled " Evaluating railway track support stiffness from trackside measurements in the absence of wheel load data " in the Canadian Geotechnical Journal.
Related media
Improving railway track design
A short video highlighting our research on railtrack improvements
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