Andrew Nash

Andrew Nash
Fachhochschule Sankt Pölten | FH St. Pölten · Centre of Competence in Railway Infrastructure and Support

Master of Engineering, UC Berkeley 1987

About

52
Publications
21,735
Reads
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586
Citations
Additional affiliations
February 2020 - present
Fachhochschule Sankt Pölten
Position
  • Senior Researcher
September 2019 - present
ETH Zurich
Position
  • Lecturer
August 2007 - present
Self-employed
Position
  • Owner
Description
  • andynash.com

Publications

Publications (52)
Article
Strategic planning is critical in helping railways develop optimal programs for improving their business by making service more attractive and efficient. Preparing a strategic plan requires comparing multiple alternatives and options, each requiring time-consuming planning, evaluation, and analysis. To improve this process Jernbanedirektoratet, Nor...
Conference Paper
Broken rails remain one of the main causes of railway accidents despite improved rail quality and inspections. Today signalling system track circuits are generally used to detect broken rails, however new signalling systems such as ETCS replace track circuits and therefore new methods are needed to detect broken rails. One promising technology is d...
Article
Full-text available
This case study describes the development of a new timetable designed to reduce delays on the London–Shenfield regional railway line in the United Kingdom (UK). Reducing delays on high-density railway lines is challenging because frequent service makes it difficult to identify the root cause of delays and there is limited ability to solve delay pro...
Conference Paper
Full-text available
Public transport priority is a well-known strategy for improving the attractiveness and efficiency of public transport, but does it still make sense in an era of micro mobility, MAAS, shared mobility and smart cities? Starting in the 1970s Zurich systematically implemented a comprehensive public transport priority program creating one of the world’...
Conference Paper
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A frequent criticism of new light rail transit systems is the negative visual impact of overhead power lines (catenary). Vehicle manufacturers have recognized this problem and developed systems that allow trams to operate without catenary. There are three main approaches: providing electricity from ground level systems, storing energy on-board the...
Article
The optimization of rail operation for improving energy efficiency plays an important role for the current and future market of rail freight services and helps rail compete with other transport modes. This paper presents a feedforward simulation-based model that performs speed profile optimization together with minor rescheduling actions. The model...
Article
Public transport costs are an important decision factor when making system design choices and network or timetable planning. Although many cost models of varying degrees of sophistication have been proposed in literature, practitioners often use relatively simple models such as purely vehicle-kilometer-based cost estimations. This paper applies a c...
Article
The freight transport industry is growing rapidly. There is great interest in improving processes and operations to make them more efficient and customer friendly. Freight transport research traditionally focuses on demand modeling, mode choice, and operational optimization. In contrast, this paper addresses a new field: development of a customer-o...
Conference Paper
This paper presents a proposed methodology for evaluating the potential energy savings available using energy-efficient driving strategies for rail freight transport. While railway transport is already very energy efficient there is still potential to reduce energy consumption thus reducing environmental impacts and operating costs. It is especiall...
Article
This paper presents an analysis of tram safety in Switzerland and best practices for operating trams in mixed traffic developed by Swiss trans operators and authorities. Operating trams in mixed traffic can create safety problems because trams have differing operating characteristics from other roadway traffic. It is not always feasible to provide...
Article
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The public transport network level is defined and is used to describe the performance and future improvement of the public transport system in Zurich, Switzerland. A public transport level is a specific type of service designed to serve a particular market. "Service" is defined as a combination of vehicles, infrastructure, and operating characteris...
Conference Paper
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Why are cities smart? Answering means defining what we mean by a smart city. Do smart cities: Use technology to make the city operate more efficiently? Have centralized control centers to monitor and manage infrastructure and services? Or do they use technology to increase public participation? A really smart city does all three. Since most discuss...
Conference Paper
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This paper presents an introduction to using games in transportation. Many organizations are using online games to help explain complicated subjects, increase awareness and encourage participation, three key transportation agency objectives. The Grr-­‐Grr-­‐Bike game was developed to better understand how mobile games could be designed to achieve t...
Article
Today many European railway networks are operating near capacity. Developing timetables for these dense and often highly congested networks is becoming increasingly difficult. Several algorithmic approaches for solving timetabling problems have been developed in recent years, but the problem size, computational complexity, and lack of transparent i...
Article
European passenger rail systems are massively interconnected and operate with very high frequency. The effects of single-component failures on these types of systems can significantly affect technical and operational reliability. Today advanced diagnostic tools with broad functionalities are being added to systems and system components. These tools...
Article
Public transport is a very efficient way to handle large traffic flows in urban areas. At the same time, and especially in Europe, nonmotorized transport is being promoted as a further environmentally friendly and healthful way of urban mobility. This push includes the introduction and extension of separate lanes to increase safety and convenience...
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The development of new transport systems often leads to demographic and socioeconomic changes in the implementation area. The extent and the type of such impacts vary, however, and can depend on existing settlement patterns, socioeconomic conditions, and project objectives. For a better understanding of such impacts better, this paper examines the...
Article
Tram train systems combine the best features of streetcars with regional rail. These systems make direct connections between town centers and surrounding regions possible by physically linking existing regional heavy rail networks with urban tram networks. The tram train approach offers many advantages by using existing infrastructure to improve re...
Article
The freight transport business is extremely challenging for railways because transport by truck has intrinsic advantages in flexibility and quality. Providing freight customers with flexible scheduling is particularly difficult because optimizing an interconnected rail operating plan is more difficult than arranging for shipment by truck. In this e...
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The Glattalbahn is an innovative new public transport system serving the rapidly urbanizing suburbs of Zurich, Switzerland. The service combines features of traditional urban and suburban transport. In the city, it operates like a streetcar using Zurich's tram network, but in suburban communities, it operates at higher speeds, with longer stop spac...
Conference Paper
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EU regulations require that public transportation systems be accessible for everyone without any restrictions. This includes not only disabled people, but also elderly, passengers with baby carriages, big sized luggage etc. i.e. all people with some kind of reduced mobility. Assuring accessibility for all is an inevitable future obligation for rail...
Article
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Increasing rail's passenger and freight transport market share would reduce energy use thereby reducing pollution and climate change. Unfortunately, many railroads have capacity constraints and are institutionally skeptical of introducing new products, operating strategies and technologies that could help them better meet the needs of today's passe...
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The punctuality and the reliability of public transport are key factors in the choice of travel mode, and they also affect operating costs. When travel time on a route varies significantly, public transport operators need to increase scheduled buffer time to maintain punctuality and reliability. This increases costs by increasing staffing and equip...
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Long-distance railway transport is more energy efficient and generates fewer environmental impacts than air and automobile travel. One strategy for increasing rail use is to introduce high-speed rail systems and other railway improvements; however, even with these capital improvements, rail travel may take too long for certain trips. Therefore, ano...
Article
Today, most large airlines operate using a hub-and-spoke strategy. At hub airports, the carriers attempt to optimize their flight schedules to minimize passenger transfer times for connecting flights. The result is a high number of flight arrivals and departures during the peak periods but only a few movements in off-peak periods. This imbalance me...
Article
A critical problem faced by railways is how to increase capacity without investing heavily in infrastructure and impacting on schedule reliability. One way of increasing capacity is to reduce the buffer time added to timetables. Buffer time is used to reduce the impact of train delays on overall network reliability. While reducing buffer times can...
Conference Paper
Accurately estimating station dwell time is critical for timetable planning. Its importance has increased as railways seek to improve timetable stability and network efficiency, while serving more passengers and different types of transport services. This research consisted of developing a station dwell time model in cooperation with the Swiss Fede...
Article
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The paper presents an introduction to using niche marketing techniques to improve the operation of public transport. It begins by defining the terms niche and niche markets including their origin in evolutionary biology. Next, the paper presents a structure for considering niche markets in the public transport industry. It identifies four specific...
Article
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European railroads must reduce costs and increase revenues if they are to remain successful during the coming years. This is especially true as intermodal competition, for example, from low-cost airlines (LCAs) increases, but also because of the coming intramodal competition, as new companies will be free to offer passenger rail service throughout...
Article
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Results of the Swissmetro European Market Study are presented. Swissmetro is a proposed high-speed passenger ground transportation system that would operate magnetically levitated trains in underground tunnels with reduced air pressure by using linear motor technology. The market study considered the market feasibility of constructing Swissmetro on...
Article
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A pricing methodology adapted to specific railroad infrastructures and the trains that use them is one way to ensure that railroad networks used by several different operators are used optimally. The diversity of railway networks (new lines and old lines) and services (long-distance and suburban passenger trains, freight trains, etc) makes it diffi...
Article
Full-text available
Delays on the regional rail system in Zurich, Switzerland, had risen to unacceptable levels by 2003 because of increasing ridership and more frequent service. The research goal was to identify the causes of delay, develop measures to reduce delays, evaluate these measures, and make recommendations. A combination of engineering and computerized stat...
Article
Delays on the regional rail system in Zurich, Switzerland, had risen to unacceptable levels by 2003 because of increasing ridership and more frequent service. The research goal was to identify the causes of delay, develop measures to reduce delays, evaluate these measures, and make recommendations. A combination of engineering and computerized stat...
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Full-text available
420 words + 7 figures + 1 Table = 7,420 words ABSTRACT Regional rail service is a cost effective way of improving public transit. In December 2004 the canton of Zug successfully introduced a new regional rail service, Stadtbahn Zug, on two existing rail lines. The Stadtbahn's vehicles, infrastructure and operations were carefully planned to meet th...
Article
Full-text available
229 words + 7 figures = 6,979 words ABSTRACT Delays on Zurich's regional rail system had risen to unacceptable levels by 2003 due to increasing ridership and more frequent service. The research goal was to identify the causes of delay, develop measures to reduce delays, evaluate these measures and make recommendations. A combination of engineering...
Article
The growing number of computer programs used to model different aspects of railway operations has created the need for a simple and efficient way to transfer data between applications. In the past, specialized interface programs have been developed to transfer data but this is an inefficient and time-consuming process. As the number of different ra...
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Full-text available
Transit priority is an excellent way of improving transit system productivity and attractiveness although it is often neglected in favor of larger investments. Transit priority techniques and implementation are outlined, Zurich's transit priority program is described, eight transit priority implementation lessons from Zurich are presented, and Zuri...
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Zurich is famous for the quality of its public transit system and it has one of the highest levels of per capita transit ridership in the world. This is because its transit service is fast, frequent, reliable, and inexpensive--- due in large part to implementation of a comprehensive transit priority program. The research describes transit priority...
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The results of Caltrain's Rapid Rail Study are described. The purpose of the study was to develop a long-range strategic capital investment plan for the commuter railroad. The plan addressed rehabilitation, upgrades, and expansion projects. The study consisted of seven major steps: developing a future service strategy, an evaluation of existing con...
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The public input process used to refine alternatives being considered for extending commuter rail service to a new station in downtown San Francisco is described. At the study's outset there were two major build alternatives with numerous design options. Through the "design options screening" process, the number of build alternatives was reduced to...
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This article introduces California' Congestion Management Program, describes some problems related to California's CMP legislation, outlines the major CMP elements, and briefly explains the issue of the environmental impact of CMPs. It is noted that CMP is intended to force local jurisdictions to integrate the land use and transportation decision-m...
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The benefits of pooling vehicles among routes that emanate from a common focus terminal are examined. In this strategy, trips are still scheduled, but vehicles are not assigned to specific trips. Instead, vehicles belonging to the pool serve all of the round trips leaving that terminal in a first in/first out sequence. Pooling improves schedule adh...
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This paper evaluates the effectiveness of reducing scheduled station dwell time to save energy on commuter rail lines. Most commuter rail schedules include a fixed amount of dwell time (e.g. 30-seconds) at each station. For stations with higher demand the station dwell time may be up to 1 minute. Generally the station dwell time is set high enough...
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This paper describes how the combined use of OpenTimeTable, a schedule analysis program, and OpenTrack, a railroad network simulation program, can be used to help develop more robust timetables. The paper describes how these programs and additional statistical analysis was used to help identify causes of delay and evaluate solutions for reducing th...
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words + 2 figures = 7,380 words ABSTRACT High speed rail is a good example of a complex social-technical system, it combines high technology with social institutions to provide transport service. However, in spite of advances in HSR technology, HSR service is operated in much the same manner as traditional passenger rail service – an unsuccessful l...
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Boarding and alighting railway vehicles poses a significant burden for people with limited mobility whether disabled, elderly, traveling with a baby carriage or in other situations. Improving rail vehicle accessibility can help increase railway use and thereby help create a more sustainable and energy efficient transport system. Improving accessibi...
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This paper seeks to stimulate thinking on improving public transit by examining the succ ess factors for low cost airlines and asking the question, how might a low cost airline operate a public transit system? The paper outlines key business strategies used by low cost airlines and suggests how public transit might apply these strategies. Thes e su...
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Web 2.0, shorthand for Internet applications that rely on users to generate content and information, has the potential to significantly improve transport systems and operations. However, Web 2.0 applications are not being introduced as quickly in the transportation planning process as in other sectors. The goal of this paper is to encourage greater...
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The paper presents an overview of an ongoing research project designed to identify methods for increasing the capacity and stability of heavily used mixed-traffic railway networks without making significant new infrastructure investments. The proposed approach combines rescheduling with network traffic control in an attempt to minimize schedule res...

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