Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Freight Train"”.
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Quantitative analyses of freight train derailments
… encompasses several areas, one of which is freight train risk analysis. There are various types of freight train accidents including derailments, collisions, highway-rail grade crossing incidents, and others. The mainline freight train derailment rate of the major U.S. Railroads (Class I) …
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On Motion Mechanisms of Freight Train Suspension Systems
<p>In this dissertation, a freight train suspension system is presented for all possible types of motion. The suspension system experiences impacts and friction between wedges and bolster. The impacts cause the chatter motions between wedges and bolster, and the friction will cause the stick and …
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Advanced Multibody Dynamics Modeling of the Freight Train Truck System
… with results from NUCARS®, an industry standard train modeling software, for similar inputs. The multibody dynamics models have also been extended to a variably damped full-truck model and a variably damped half-truck warping model. These models were reformulated to react dynamically to simulated …
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Models and algorithms for dynamic real-time freight train re-routing
This dissertation focuses on solving a train re-routing problem in a near real-time context for a freight train carrier operating over a large network. A holistic evaluation framework is developed using a time-space network model. Computational results using data from a class I railroad in the …
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A simulation of New Haven railroad freight train and yard operations
Thesis: B.S., Massachusetts Institute of Technology, School of Industrial Management, 1963
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Computer decision aiding under soft boundaries with application to freight train dispatching
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Estimating the conditional derailment probability of release (CDPR) of tank cars in freight train derailments
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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A study of freight train operation on the Boston and Maine Railroad with special reference to Tonnage Rating and utilization of motive power
Thesis: M.S., Massachusetts Institute of Technology, Department of Civil and Sanitary Engineering, 1931
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Generic camera calibration for omnifocus imaging, depth estimation and a train monitoring system
… from focus and machine vision based intermodal freight train analysis. In the first prat of this dissertation, we present new progress made in the areas of camera calibration with application to omnifocus imaging and 3D scene depth from focus and point spread function calibration. In camera …
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Estimation of run times in a freight rail transportation network
… thesis is to improve the accuracy of individual freight train run time predictions defined as the time between departure from an origin node to arrival at a destination node not including yard time. A correlation analysis is conducted to identify explanatory variables that capture predictable …
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Dispatching logic, corridor simulation, and train following algorithms to quantify the benefits of virtual and moving block control systems on North American freight railroad mainlines
… block railway control systems on North American freight railroad mainline corridors. Virtual and moving block control systems are one potential strategy for improving mainline operations such that corridors currently operating at capacity can maintain performance under a projected 24% increase in …
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Analysis of the performance and failure of railroad concrete crossties with various track support conditions
… to timber crossties to accommodate heavy axle freight train loads. As the number of concrete crossties has grown, the importance of understanding the performance of these components has also increased. This is especially true given derailments have been linked to the condition of concrete …
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Capturing videos of trains under ambient lighting conditions for computer vision analysis
Intermodal trains are usually the fastest freight trains in North America. Fuel con- sumption in these trains is high because of their aerodynamic characteristics. If the loads on these railcars were placed in better con gurations, it would be possible to reduce fuel consumption. In order to …
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A Multibody Dynamics Approach to the Modeling of Friction Wedge Elements for Frieght Train Suspensions
… the interaction of the damping element in a freight train suspension, the friction wedge, with the bolster and the side frame. The objective of the proposed approach is to produce a stand-alone model that can better characterize the interaction between the bolster, the friction wedge, and the …
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Influence of track arrangement on expanding rail corridor capacity and operations
The North American freight railroad network is projected to experience rising freight transportation demand in the coming decades, coupled with continued interest in expanding passenger services. Congestion resulting from these demands strains the capacity of rail lines and jeopardizes the …
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Performance of Fouled Railroad Superstructure Subjected to Traversing Heavy Haul Trains
… serve the needs of modern societies for moving freight and people. Therefore, the sustainability and safety of railroad infrastructure are of paramount importance for securing transportation needs. Freight train passby loads increase the surface deformation of railroad substructure due to …
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Analysis of the design of railroad track superstructure components for rail transit applications
… on a shared corridor with both commuter rail and freight train traffic, targeting specific aspects for each of the track components included in the study. Extensive field monitoring spanned over several months for all the sites and large data sets were developed. Flexural performance results of …
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Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation
US railways move more freight (measured in tonne-kms) by rail than by any other means. This is done over an extensive network of primarily private freight railway lines that also transport passenger trains. To enable the expansion of high-speed passenger rail service using shared passenger/freight …
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The Process of Design for General Classroom Facilities in Higher Education Institutions
… data collected from this process produced the Train Model of Design for General Classroom Facilities. The process begins with the specifics of the institution or college and its chosen direction. The conditions specific to the institution act as a departing station for the process. The …
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Complex Bogie Modeling Incorporating Advanced Friction Wedge Components
The design of the freight train truck has gone relatively unchanged over the past 150 years. There has been relatively little change to the fundamental railway truck design because of the challenges of implementing a cost effective and reliable modification to designs that have proven effective in …
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