Sustainable Railway Engineering and Operations: Volume 14

This introductory chapter sets the context for the remainder of this book by setting out general concepts of sustainability and briefly discussing how they have impacted on railway system development over time. It considers the recent rise in prominence of environmental sustainability and how this is likely to increase the importance of railways in meeting society’s future needs for transportation.

This chapter covers the range of issues which need to be considered when planning a new railway route or system. These issues are grouped under the three main aspects of sustainability: social, environmental and economic, while noting that there are inevitably some overlaps between them. This chapter therefore provides information which can help ensure that a holistic and comprehensive consideration of sustainability is embedded in the planning process. It also discusses how the various impacts associated with the construction and operation of a new railway route or system can be compared and assessed in order to determine whether or not a proposed rail scheme should go ahead.

Stations have two main functions. The primary function of a station is to connect different modes quickly and easily with each other, this is when passengers are moving from one place to another. The secondary function is to make sure that passengers can spend their (waiting) time at a station in a pleasant way when they are staying at the station. Interchanges have to be designed to make moving as efficient as possible and staying as pleasant as possible. This means that users want a station where they can move safe, fast and easily and spend their time in a comfortable and pleasant way. The station experience can be enhanced with optimal (intuitive) wayfinding and environmental stimuli (e.g. music, light, colours, infotainment and advertisements) that can turn a transport interchange into an efficient node and a positive unique place. In this chapter, we explain how the quality of stations can be improved.

Community rail is a grassroots movement that spans Britain, made up of hundreds of community groups and partnerships that engage people with their railways and stations and provide a bridge between the rail industry and the public at a local level. The movement has grown up from the grassroots, but it has also been increasingly supported and nurtured by the rail industry, with train operators proactively encouraging its spread and development. They, and national and devolved governments, recognise the value of community rail, and its contribution to social inclusion, sustainable development and the railway’s ability to prosper and serve passengers and communities well, now and in the future. This idea is supported by passenger data showing that railway lines with community rail partnerships – working to enhance, promote and aid access to those lines – outperform comparable lines. A swathe of qualitative evidence shows community rail partnerships and station groups having a demonstrable impact on their localities and people’s lives, and appreciation of this role by industry leaders. The many examples of community rail volunteers and practitioners bringing about positive change resonate with academic research exploring how civic engagement and local efficacy and communications can support change, particularly with regard to sustainable behaviours and development. A range of researchers argue that localised, interactive engagement and communications may be the key, when it comes to bringing about the major shifts in behaviour needed to address the global, existential threat posed by the climate crisis, which unsustainable behaviours and policies have brought about. In this way, evidence suggests that engaging communities with their railways, and local transport networks generally, is critical, both to these networks operating in a truly sustainable manner and to achieving inter- and intra-generational equity within the communities they serve.

The railway track system is the platform by which loads from moving trains are transferred to the underlying soil or supporting infrastructure such as bridges. The most common type of railway track system is ballasted track, which has been in use for over a century. Ballasted track has proved versatile. It can be constructed using locally available materials and with modifications to the rails and sleepers, crossings transferring trains from one route to another can be created. The structure of a ballasted track system consists of two main parts. The upper portion, termed the superstructure, comprises the rails, fastenings and sleepers. It is formed of components whose shape, stiffness and strength are designed and closely controlled. Below the superstructure is the substructure, which comprises the ballast and sub-ballast. Although the materials used in the substructure may have been specified, their engineering properties and geometric placement are less well controlled. In this chapter, we will explore how a typical ballasted track system transfers load to the ground and the ways in which the track form deteriorates, requiring maintenance and eventually renewal.

Earthworks are the embankments and cuttings that allow a railway to maintain a certain line, level and grade through the landscape. Earth embankments consist of an engineered bank of earth that carries the railway above the natural ground. A cutting is used to carry the railway through ground with a natural level above the line of the railway. Modern (post 1960s) earthworks are carefully engineered to perform well. However, many railways run on earthworks that were constructed over 100 years ago without the use of mechanised plant. The quality of construction of older earthworks was often poor compared with present-day engineering practice. Ageing of the earthwork structures, and the greater demands of heavier and faster trains and climatic change, means that earthworks suffer ultimate and serviceability failures that can present operational difficulties. Older earthworks that fail or do not perform well require maintenance and repair, and sometimes complete replacement. This chapter explores the main engineering considerations for modern earthworks, and the challenges associated with older earthworks including their modes of failure and upgrade and repair.

The public’s awareness of noise and vibration forms a significant barrier to further development of railways. This chapter begins with a short introduction to the main fundamental aspects of acoustics, including decibels, frequency analysis, the propagation of sound with distance and common measurement quantities. The main sources of railway noise are discussed, including rolling noise, impact noise, curve squeal and aerodynamic noise. Simple calculation procedures are described that can be used to assess the impact of railway noise and to compare it with legal limits. The final section is devoted to ground vibration, which is a related form of environmental disturbance.

The vehicle–track interaction and the resulting dynamic response of the vehicle involve a number of complex nonlinear problems. Large vertical loads act through a small contact patch leading to very high contact pressures. Transverse loads acting through this contact induce a relative velocity between wheel and rail expressed in non-dimensional form as a creepage. The wheel and rail profiles determine the contact patch shape and affect the ability of the vehicle to run stably. If the yaw stiffness of the axles is too low, the vehicle will become unstable at a relatively low speed; conversely, if the yaw stiffness is too high, the curving behaviour will be adversely affected. The vehicle suspension, especially the secondary suspension, also affects the ride comfort of passengers. Finally, it is shown how the speed profiles of accelerating and decelerating trains can be calculated from basic assumptions about the train power, adhesion and rolling resistance.

This chapter provides a taxonomy of key rolling stock types and covers the key engineering principles. This chapter concentrates on the aspects of the rolling stock that make it sustainable in terms of passenger transportation; these aspects are primarily safety and crashworthiness. These are specific items that contribute to make the rolling stock and hence rail system more sustainable; passengers need to be confident that they are travelling in safe rolling stock and the vehicle consist, manufacturing technique or materials used should not compromise the crashworthiness aspects. For this reason, all aspects of this chapter reference vehicle safety and crashworthiness.

The role of railways within urban areas is analysed, covering ‘metro’ systems (self-contained heavy rail networks, often with substantial underground sections), light rail (both upgraded street tramways and newer systems), and travel by regional and national railways within urban areas. Basic operating characteristics, system capacity, capital costs, and technological change are examined. ‘Sustainability’ is analysed in respect of energy use and environmental impact, railways’ role in supporting high-density urban living (with associated benefits through greater use of non-motorised modes), and financial aspects (coverage of operating costs and ability to finance capital renewals). Current issues examined include the effect of users shifting to more flexible working patterns, the Covid pandemic, automation, and ownership. In general, urban railways can be seen to support a sustainable lifestyle, although some issues do arise in respect of longer distance commuting.

High-speed rail, as a distinct subset of rail systems, has been in operation since 1964, first introduced in Japan and subsequently adopted widely in heavily populated countries across Europe and Asia with plans in place to extend to America and Australia. Development of technologies has been continuous such that maximum speed in service operation has safely increased from 210 to 350 km/h with further advances to come in the next decade. Its economic and social effect through reducing journey time between cities while also offering very high capacity, reliability and safety with a low-carbon footprint means it is no longer considered by sponsoring governments on its merits as a transport system but rather as part of a wider set of strategic policies around housing settlement and employment. Analysis techniques continue to be developed to estimate true benefits alongside construction, environmental impact and operational costs.

Of the three ‘pillars of sustainability’, railways’ initial focus was on the economic pillar, having been developed in the nineteenth century to enable economic development and having struggled in the mid-twentieth century to maintain their economic sustainability in the face of competition from road and air transport. From the 1960s onwards, increased focus on and concern about social and environmental sustainability, together with rail’s comparatively high capacity and low environmental impact, has led to renewed interest in the role of rail in passenger and freight transport. Providing the necessary railway system capacity to enable a significant modal shift from air and (especially) road transport requires major investment, and there is a trade-off between the economic sustainability of these investments and the resulting social and environmental sustainability benefits. However, the railways should also benefit from the increased revenue resulting from improved services and could be supported by additional financial incentives to encourage modal shift. Similarly, there are different philosophies of and approaches to timetable planning and development, ranging from making the most economically sustainable use of resources to the provision of high-frequency, integrated ‘clockface’ timetables, providing passengers and freight users with an attractive range of travel and transport opportunities. Future sustainability, capacity, timetabling and other aspirations are set out in the Rail Safety and Standards Board’s Operational Philosophy for the GB Mainline Railway: these aspirations were developed in the context of Britain’s heavy rail system but are also more generally applicable.

This chapter provides basic knowledge on the principles used in modern signalling systems to ensure safe train separation and to establish safe routes through point zones. For train control, lineside signals are compared with cab signalling. For block protection, fixed block and moving block systems are covered. The described interlocking principles for routes leading through point zones include route locking and release, conflicting routes, flank protection, and overlaps. A section on automatic train protection explains the principles of how trains can be prevented from violating speed and authority limits. For this, an overview on the levels of the European Train Control System is provided. Some information is also given on train describers and automatic route setting systems to support traffic management in signalling centres.

Digital technologies provide an opportunity for the rail sector to achieve social, economic and environmental sustainability, if implemented correctly. Unlocking the full potential of technology, however, will require significant changes beyond the technological. Physical assets will need to link with digital assets, making best use of data, simulation and modelling. Transformational leadership informed by systems engineering will be necessary to deliver the change process required to innovate across the whole railway life cycle. Each of these digital railway elements – technology, data, simulation, transformational leadership and systems engineering – presents challenges to be overcome. The authors believe that by instilling core values alongside technical expertise, by being open, resilient, responsive, customer-centric and valuing people, the digital railway has the power to transform the sector. It will enable improved railway processes; safer, faster and more reliable trains; better customer experience; cost-effectiveness; and reduced carbon emissions and more. The digital railway will not just realise the current vision but form the foundation for a sustainable railway to meet changing mobility needs well beyond 2050.

This chapter reviews railways with respect to their organisation, regulation and ownership, with particular reference to the reforms undertaken in Great Britain in the mid-1990s. First, with respect to organisation, railways constitute a complex industry that has tended to be dominated by integrated monoliths, often organised hierarchically and reliant on governance by command and control. More recently, countries such as Great Britain have experimented with more fragmented, atomistic structures reliant on governance by contract. Second, since their inception, railways have attracted regulation in terms of varying degrees of public control of fares, service quantity and quality, safety and rates of return. More recently, there has been an emphasis on pro-competition policies with respect to open access services (on the tracks competition) and franchising/concessions (off the tracks competition). Third, in terms of ownership, although many railways originated as private companies, a series of nationalisations meant that by the mid-1990s, most were in public ownership, although there have since been a number of privatisations and experiments with public–private partnerships. The focus of these changes has been mainly on the economic performance of the railways, with relatively little emphasis on social and environmental factors. Where sustainability has been considered, it has been mainly terms of determining organisational and financial structures that can last, with the search for such sustainable structures a continuing process.

This chapter begins by outlining the ‘theory’ behind the achievement of a financially sustainable railway, before then examining the realities faced when implementing that theory. This is from the context of the main railway financial outgoings and sources of revenue in both the short- and long-term time horizons. What it suggests is that attainment of such a position has proved to be extremely difficult in practice, with the main reasons for such difficulties outlined and discussed. What is clear, however, is that any such initiatives revolve around the establishment of rigid and robust regulatory and organisational structures that create and maintain a clear separation between state and railway, strongly supported by the ideas of rail financing and rail funding.

This chapter reviews the safety of railway operation in Europe particularly by examining the causes of fatalities over periods of up to three decades ending in 2017. Fatalities are examined to passengers, staff, level crossing users, and trespassers, together with a brief look at suicides. The accidents that attract most attention are fatal train collisions and derailments because they can result in multiple fatalities, and are in most cases wholly the responsibility of the railway operators. However, train accidents are infrequent, and account for only about 1% of all railway fatalities if suicides are included, or 3% if they are not. The fatal train accident rate per train-kilometre fell at a rate of 5.4% per year between 1990 and 2017 and was 77% lower in 2017 than it had been in 1990. This chapter goes on to discuss level crossings, which account for far more fatalities than train accidents, personal accidents, accidents to trespassers, and suicides. This chapter ends with a brief look at the evidence of the effect of rail restructuring on safety.

This chapter describes the approach to sustainable rail passenger rolling stock in terms of interior passive safety requirements within the European market. It is intended to give the background and logistical approach for the future introduction of a standard as an aid for the design and validation of the interiors of passenger rail vehicles. Also discussed is the acceptance of the proposed European-based standard into the regulatory system of the technical specifications for interoperability. Methodologies for design assessment and validation will be discussed. This chapter is intended to encourage an acceptance of the standard for interior passive safety as a realistic and cost-effective method of improving rail vehicle safety in terms of the passenger interfaces with the rail stock interior.

This book has reviewed the sustainability of rail engineering and operations with respect to both existing assets and new build in terms of the three pillars of economic, social and environmental sustainability. It is argued that the composition of a sustainable railway is well understood, but there are practical issues with delivery. These issues may be overcome with an emphasis on infrastructure provision, finance (and funding), top-down governance and bottom-up participation.