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Railroad Conference, 1995., Proceedings of the 1995 IEEE/ASME Joint

Date 4-6 April 1995

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Displaying Results 1 - 25 of 25
  • Non-Hertzian conformal contact at wheel/rail interface

    Publication Year: 1995, Page(s):137 - 144
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (499 KB)

    The Transportation Technology Center conducted an investigation to study non-Hertzian conformal contact, roller conformal contact, and Hertzian counterformal contact at the wheel/rail interface. The computational results show that a significant error (up to 72 percent) in both stress distribution and contact area may be produced by using the approximate Hertzian conformal solution to solve non-Her... View full abstract»

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  • Proceedings of the 1995 IEEE/ASME Joint Railroad Conference

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (610 KB)
    Freely Available from IEEE
  • Wheel/rail profile studies

    Publication Year: 1995, Page(s):159 - 162
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The subject of determining the proper profile of either the wheel or rail has long been a source of controversy. Practices have evolved and become common in monitoring the rail profile and keeping it in conformance with researched profiles that offer maximum rail life. However, with the wheel, preventative measures to maintain the accepted profile have not been widely adopted. Burlington Northern ... View full abstract»

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  • Modelling moving-block railway signalling systems using discrete-event simulation

    Publication Year: 1995, Page(s):105 - 111
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    This paper describes a discrete-event simulation model for performance evaluation of practical fixed and moving block railway signalling systems using track conductor loops to transmit continuous information between wayside and train. The fixed block system simulated has unidirectional transmission, and the moving block system has bidirectional transmission. The simulation results identify the phy... View full abstract»

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  • Train scheduling desynchronization and power peak optimization in a subway system

    Publication Year: 1995, Page(s):75 - 78
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Simultaneous train departures can induce important power peaks in subway systems. In this paper, the authors study the possibility of optimally reducing instantaneous power peaks by slightly delaying scheduled train departures. The problem consists of finding the optimal set of delays to reduce the maximum peaks seen at the system substations subject to frequency, safety and operation constraints.... View full abstract»

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  • Transit technology assessment

    Publication Year: 1995, Page(s):153 - 158
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The paper describes the comparative assessment of fixed-guideway transit technologies to aid in the decision-making process for the selection of a new transit system for a typical large city. It is assumed that no fixed-guideway system exists and that public transportation is now provided by buses. It is also assumed that ridership projections have been made for the new transit system so that line... View full abstract»

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  • The influence of policy and operating decisions on systems elements of the Chicago Circulator

    Publication Year: 1995, Page(s):29 - 38
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1060 KB)

    Chicago's Central Area Circulator was conceived over twenty years ago as a subsurface rail transit system designed to link commuter rail stations on the west side of the City, CTA subway and elevated stations within the City's central loop and the expanding commuter and visitor destinations on the north and east sides. Heartened by the success of urban light rail systems in Europe and (limited) ce... View full abstract»

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  • Vista rail network simulation

    Publication Year: 1995, Page(s):93 - 98
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Vista is a quick-running rail network simulation software package. It allows rail analysts to assess, predict and identify improvements to rail operations as well as design new rail and signalling systems. Vista calculates train performance based on: (1) specified physical characteristics of the trains and the track; (2) train routing; and (3) train control system and junction management algorithm... View full abstract»

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  • SEPTA's Broad Street Subway signal system modernization project Philadelphia, Pennsylvania

    Publication Year: 1995, Page(s):99 - 104
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The Southeastern Pennsylvania Transportation Authority (SEPTA) is designing the modernization of the signal system on the Broad Street Subway, which runs north-south through the center of the City of Philadelphia. This project will replace the existing wayside and trip stop signal system with a continuous automatic train control (ATC) cab signal system, without wayside signals except at interlocki... View full abstract»

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  • Amtrak's high-speed trainset program

    Publication Year: 1995, Page(s):1 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    The author describes how, in September, 1994, Amtrak issued a specification for 26 high-speed trainsets. Twenty-four will be electrically powered for the Northeast Corridor and operate at speeds up to 150 mph (240 km/h). Two will be diesel- or turbine-powered for emerging high-speed corridors, and will operate at speeds up to 125 mph (200 km/h). The trainsets will have many characteristics of the ... View full abstract»

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  • Load sharing with thyristor controlled rectifier substations

    Publication Year: 1995, Page(s):69 - 73
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Thyristor controlled rectifier substations (TCRS) accomplish energy management objectives by controlling load flow. Voltage sources connected in parallel to a common grid share load dynamically in a complex relationship between the DC output voltage sources at fixed traction power substation locations and time variant loads at moving vehicle locations. Conventional diode rectifier sources with inh... View full abstract»

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  • Wheel-rail resistance and energy consumption analysis of cars on tangent track with different lubrication strategies

    Publication Year: 1995, Page(s):129 - 136
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    This paper presents an analytical solution to determine wheel-rail resistance and energy consumption on tangent track. It analyzes three different lubrication strategies: flange lubrication, top of rail (TOR) lubrication and TOR plus flange lubrication. Analysis of a single wheelset based on force balance, slip balance and wheelset integrity, is used to determine its resistance and energy consumpt... View full abstract»

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  • Effect of wheel diameter on high-adhesion locomotive wheel tread thermo-mechanical stresses

    Publication Year: 1995, Page(s):119 - 127
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    A simplified thermoplasticity tread surface computer model for estimating the resulting stresses and plastic strains in the wheel treads of high adhesion locomotives is summarized. The nature and severity of the thermo-mechanical (TM) tread surface material cyclic loading associated with this new generation of driving wheels is then illustrated for a particular high traction AC locomotive starting... View full abstract»

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  • Energy savings through regenerative braking using retrofit converters

    Publication Year: 1995, Page(s):55 - 61
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    This paper explores the benefits and feasibility of retrofitting existing phase controlled DC motor drives in the Queensland Rail coal transport system with PWM rectifier technology. The major benefits of this would be, the replacement of the dynamic brake with a regenerative system and unity power factor operation with a high quality input current waveshape. Test results indicate that very signif... View full abstract»

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  • Impedance calculations for SEPTA's rail power distribution system

    Publication Year: 1995, Page(s):79 - 85
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The Southeastern Pennsylvania Transportation Authority (SEPTA) owns and operates an electrified system of commuter rail lines in Philadelphia and its suburban areas. The traction power supply system is of an autotransformer type and is supplied from three static frequency converters each rated at 15 MVA. The system trolley circuits are supplied at 12 kV, 25 Hz and the feeders are supplied at 24 kV... View full abstract»

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  • Composite economics and use

    Publication Year: 1995, Page(s):163 - 166
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Since deregulation of the US railroads in the early 1980s, competition has spurred many innovations in track, structures, signaling and rolling stock. Freight cars in particular have seen significant changes in material use, as evidenced by the huge growth in aluminum bodied coal cars. Another change in material use in freight cars is underway. Advanced composites are finding their way into more a... View full abstract»

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  • The next generation high-speed rail technology program at FRA

    Publication Year: 1995, Page(s):9 - 14
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    As authorized in the Swift Rail Development Act of 1994, the Federal Railroad Administration (FRA) may undertake activities for the improvement, adaptation, and integration of proven technologies for commercial application in high-speed passenger rail service in the US. Since the sole operator of intercity passenger rail service in the country, Amtrak, has initiated a program to complete the elect... View full abstract»

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  • IVHS protection at light rail grade crossings

    Publication Year: 1995, Page(s):39 - 45
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Many light rail grade crossings are located at the intersection of two streets. Rail movements through these complex intersections are typically protected by conventional traffic signals. There is considerable evidence to suggest that drivers do not fully understand their responsibilities at these crossings. When this misunderstanding results in an accident it can cost the transit operator and soc... View full abstract»

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  • Computer modeling, simulation, and validation by field testing of a traction power system for electric trolley buses

    Publication Year: 1995, Page(s):87 - 91
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The objective of this project was to determine the electric current, voltage and power in the Miami Valley Regional Transit Authority (RTA) trolley bus system as a function of time and location. First, a computer based load flow study was performed using the “Transportation Systems Energy Management Model (EMM)” of the Rail Systems Center of Carnegie-Mellon University in Pittsburgh, US... View full abstract»

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  • The Baltimore Central Light Rail Line light rail vehicle procurement

    Publication Year: 1995, Page(s):47 - 53
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    This paper describes how the Baltimore Light Rail Vehicle (LRV) specification was developed so quickly, the unique characteristics of the vehicle, and the successful procurement, testing, and use of the vehicle in revenue service. The Baltimore LRV procurement was a critical path activity because the Maryland Mass Transit Administration (MTA) adopted a fast track procurement process. The specifica... View full abstract»

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  • Testing of rail vehicles for higher speeds on existing lines

    Publication Year: 1995, Page(s):15 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The Federal Railroad Administration (FRA), together with its industry and state government partners, has tested several types of passenger rail equipment to evaluate the safety aspects of operating these vehicles at higher speeds on existing lines. The FRA's approach to safety at these regimes has been to consider the equipment and the track as an integrated system; neither the track nor the equip... View full abstract»

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  • An integrated systems engineering approach to managing the implementation of new transit technologies

    Publication Year: 1995, Page(s):19 - 28
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    The TTC's (Canada) Rapid Transit Expansion Program includes the construction of two new subway lines (Eglinton West and Sheppard) which interconnect with the existing subway system. These new lines will incorporate new transit system technologies in several areas, including: platform edge doors; communications-based automatic train control; and a system-wide network for data and voice communicatio... View full abstract»

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  • A/C locomotives in North American service: a benefits assessment

    Publication Year: 1995, Page(s):145 - 151
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The rebirth of the US railroad industry following deregulation has produced innovation in locomotive manufacturing. Both GE and EMD have announced several new models since 1992, and an entirely new manufacturer (MX Rail) has entered the market. All three builders are promising large increases in horsepower and the use of AC traction. However, the benefits of these innovations are unclear. “U... View full abstract»

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  • A general model for optimization of track circuit parameters

    Publication Year: 1995, Page(s):113 - 117
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    This paper presents a general algorithm which allows for the rapid optimization of track circuit parameters such as frequency, length, end impedance, etc., and includes the effects of bypasses and coupling. The algorithm is based on a mathematical model of the track circuit utilizing a 2(P+1) multiport network and involves the solution of the appropriate matrix equations. Based on this algorithm, ... View full abstract»

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  • Electro-hydraulic suspension control for low floor light rail vehicles

    Publication Year: 1995, Page(s):63 - 67
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The inherent space constraints associated with low floor light rail vehicles (LFLRV) and the requirements for high performance systems are demanding new developments in vehicle suspension technology. It has become increasingly difficult to accommodate the weight, space, and additional costs associated with a pneumatic suspension system in order to maintain a high ride quality and satisfy vehicle h... View full abstract»

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