Louis Le Pen
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View article: Mechanically coupled distributed dynamic strain measurement for track systems and earthworks
Mechanically coupled distributed dynamic strain measurement for track systems and earthworks Open
Distributed optical fibre sensors are one of the few sensing technologies that could be embedded into our infrastructure to provide quantitative and mechanistic measurements of the condition of the infrastructure at network scales. This st…
View article: Validation, interpretation and use of railway track acceleration data
Validation, interpretation and use of railway track acceleration data Open
It has for many years been relatively straightforward to attach an accelerometer to a railway track and obtain data of track accelerations as trains pass. However, not all devices are suitable and there are a number of potential pitfalls i…
View article: Railway Track Deterioration Models: A Review of the State of the Art
Railway Track Deterioration Models: A Review of the State of the Art Open
There has been a railway renaissance in Britain since the 1990s, with passenger kilometres approximately doubling between 1990 and 2019. Despite changing habits caused by the COVID-19 pandemic, the latest data show that passenger journeys …
View article: Reducing the settlement of railway ballast by random fibre reinforcement
Reducing the settlement of railway ballast by random fibre reinforcement Open
Random fibre reinforcement of granular soils with flexible polymeric fibres increases their shearing resistance and ductility. However, the potential advantages of fibre reinforcement are not limited to monotonic loading conditions. Recent…
View article: Physical and numerical investigation of integral bridge abutment stiffness due to seasonal thermal loading
Physical and numerical investigation of integral bridge abutment stiffness due to seasonal thermal loading Open
Integral Abutment Bridges (IABs) are increasingly popular due to their reduced maintenance cost compared to traditional bridges with expansion joints. However, the widespread construction of IABs is currently limited by design code prescri…
View article: Modelling the improved behaviour of a switch installed on ballast-asphalt track
Modelling the improved behaviour of a switch installed on ballast-asphalt track Open
Switches and crossings are a critical part of railway infrastructure and have a complex superstructure, creating variable support and bending stiffness along the track length. These variable structural and loading effects lead to faster ra…
View article: Reusing Life-Expired Railway Ballast: Laboratory Testing, Shape Analysis, and Petrographic Evaluation
Reusing Life-Expired Railway Ballast: Laboratory Testing, Shape Analysis, and Petrographic Evaluation Open
During its service life, railway ballast degrades. Individual grains are abraded, asperities may break off, and the assembly loses performance as the finer material created progressively fouls the assembly. The causes of this are the repea…
View article: Grain characterisation of fresh and used railway ballast
Grain characterisation of fresh and used railway ballast Open
Ballasted railway track requires regular maintenance to reverse the effects of plastic deformation of the trackbed, which leads to a gradual loss of level. Maintenance is usually by tamping, an aggressive process, which damages ballast gra…
View article: Sustainable Railway Engineering and Operations
Sustainable Railway Engineering and Operations Open
Railways are frequently promoted as one of the most sustainable modes of transport. However, their impact will in practice be significantly affected by the ways in which they are designed, constructed, and used. This book provides a compre…
View article: Challenges and perspectives for integral bridges in the UK: PLEXUS small-scale experiments
Challenges and perspectives for integral bridges in the UK: PLEXUS small-scale experiments Open
This study focuses on the investigation of the factors that have limited, so far, the development of a consistent design and assessment approach for integral bridges (IBs). This paper presents a review of previous research and current desi…
View article: Data set for "The influence of sleeper material characteristics on railway track behaviour: concrete vs composite sleeper"
Data set for "The influence of sleeper material characteristics on railway track behaviour: concrete vs composite sleeper" Open
Data to create figures from the article: Ferro, E., Harkness, J., & Le Pen, L. (2020). The influence of sleeper material characteristics on railway track behaviour: concrete vs composite sleeper. Transportation Geotechnics.
View article: The role of stiffness variation in switches and crossings: Comparison of vehicle–track interaction models with field measurements
The role of stiffness variation in switches and crossings: Comparison of vehicle–track interaction models with field measurements Open
The performance of switches and crossings compared with plain line is complicated by the presence of movable parts, changing rail geometry and non-uniformities in the composite and/or trackbed stiffness. These features lead to complex vehi…
View article: The influence of variation in track level and support system stiffness over longer lengths of track for track performance and vehicle track interaction
The influence of variation in track level and support system stiffness over longer lengths of track for track performance and vehicle track interaction Open
Differential settlement leading to the development of track geometry irregularity drives the need for maintenance of ballasted railway tracks. Predicting the development of differential settlement requires an understanding of how train loa…
View article: Analysis of a bridge approach: long-term behaviour from short-term response
Analysis of a bridge approach: long-term behaviour from short-term response Open
Transition zones are locations where trackbed support conditions change abruptly, for example from an earth embankment onto a bridge. The track geometry at these sites degrades faster than regular railway track, requiring more frequent and…
View article: Data for 'A model for stochastic prediction of track support stiffness'
Data for 'A model for stochastic prediction of track support stiffness' Open
This dataset supports the publication: Le Pen, L., Milne, D., Watson, G., Harkness, J., & Powrie, W. (Accepted/In press). A model for stochastic prediction of track support stiffness. Proceedings of the Institution of Mechanical Engineers,…
View article: Dataset for: Behaviour of Under-Track Crossings on Ballasted Railway
Dataset for: Behaviour of Under-Track Crossings on Ballasted Railway Open
Data from figures in paper: Behaviour of Under-Track Crossings on Ballasted Railways in Transportation Geotechnics.
View article: Dataset for The effect of sleeper interventions on railway track performance
Dataset for The effect of sleeper interventions on railway track performance Open
Dataset for article: Abadi, T. et al (2018). The effect of sleeper interventions on railway track performance. Journal of Geotechnical and Geoenvironmental Engineering.
View article: Monitoring and repair of isolated trackbed defects on a ballasted railway
Monitoring and repair of isolated trackbed defects on a ballasted railway Open
Ballasted railway track suffers from a gradual loss of vertical geometry (level) as a result of settlements caused by trafficking and differences in support conditions. However, certain trackbed defects giving rise to a particularly rapid …
View article: Data set for "Modelling the effects of trafficking and tamping on scaled railway ballast in triaxial tests"
Data set for "Modelling the effects of trafficking and tamping on scaled railway ballast in triaxial tests" Open
Data for the paper Aingaran, S., Le Pen, L., Zervos, A., & Powrie, W. (2018). Modelling the effects of trafficking and tamping on scaled railway ballast in triaxial tests. Transportation Geotechnics.
View article: Automated processing of railway track deflection signals obtained from velocity and acceleration measurements
Automated processing of railway track deflection signals obtained from velocity and acceleration measurements Open
Measurements of low-frequency vibration are increasingly being used to assess the condition and performance of railway tracks. Displacements used to characterise the track movement under train loads are commonly obtained from velocity or a…
View article: Dataset for full scale measurements of train underbody flows and track forces
Dataset for full scale measurements of train underbody flows and track forces Open
Data to recreate figures for the associated article: Soper, D. et al (2017). Full scale measurements of train underbody flows and track forces. Journal of Wind Engineering and Industrial Aerodynamics, 251-264.
View article: Behaviour of under sleeper pads at switches and crossings – Field measurements
Behaviour of under sleeper pads at switches and crossings – Field measurements Open
Major growth in rail traffic in many parts of the world in recent years has brought railway networks close to capacity and restricted the time available for track access to carry out maintenance work without costly temporary route closures…
View article: Properties of train load frequencies and their applications
Properties of train load frequencies and their applications Open
A train in motion applies moving steady loads to the railway track as well as dynamic excitation; this causes track deflections, vibration and noise. At low frequency, the spectrum of measured track vibration has been found to have a disti…