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Showing 1 to 20 of 30 for “"railroad track"”.
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Computer vision for railroad track inspection
In railroad track inspection, the inspection images contain periodically occurring components. Computer vision has recently been applied to several railroad applications due to its potential to improve the efficiency, objectivity, and accuracy when analyzing large databases of acquired video and …
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Behavior of Bituminous Aggregate Mix for Use in Railroad Track
Made available in DSpace on 2014-12-08T23:57:06Z (GMT). No. of bitstreams: 1 6901362.pdf: 7939847 bytes, checksum: 1c8ef42d24ef2fbbe3465dbda6bc95bb (MD5) Previous issue date: 1968
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Development of machine-vision technology for inspection of railroad track
Railroad engineering practices and Federal Railroad Administration (FRA) regulations require track to be inspected for physical defects at specified intervals, which may be as often as thrice per week. These inspections are conducted visually by railroad track inspectors, but due to practical …
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Railroad track fastening system demands and response: Implications for mechanistic design
The student, Marcus Dersch, submitted this Dissertation for approval on 2022-04-20 at 09:13.
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Development of relationships and trending methodologies for railroad track component and geometry data
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Analysis of the design of railroad track superstructure components for rail transit applications
An extensive study of the performance of railroad superstructure in rail transit systems was conducted at the University of Illinois at Urbana-Champaign (UIUC) as part of a research program funded by the Federal Transit Administration (FTA). Focusing on field characterization of the performance of …
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Evaluation of a methodology for detecting railroad track geometry anomalies and determining rail vehicle fatigue loads
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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Development of the track structural capacity rating (TSCR) and example use case for low volume railroad track
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Development of a track structure condition index (TSCI)
… the U.S. Army, and public and private local railroad companies own and operate nearly 25000 miles of railroad track. Although traffic is generally low volume and low speed, this track serves a vital transportation niche. A technological gap existed, however, in that a simple method was not …
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Advanced image analysis and techniques for degradation characterization of aggregates
… sources are known to affect pavement and railroad track mechanistic behavior and performance significantly in terms of strength, modulus and permanent deformation. Under repeated traffic loading aggregate particles used in construction of pavement and railroad track are routinely subjected …
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Performance of Geogrid Reinforced Ballast under Dynamic Loading
Railroad ballast consists of open graded crushed stone used as a bed for railroad track to provide stability. It plays a significant role in providing support for the track base and distributing the load to the weaker subgrade below. Ballast also helps with drainage, which is an important factor …
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Multi-objective combinatorial optimization problems in transportation and defense systems
… in system of systems architecting and railroad track inspection scheduling. In particular, multi-objective system of systems architecting problems with system flexibility and performance improvement funds have been investigated. Efficient solution methods are proposed and evaluated for …
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Railroad Tie Lateral Resistance on Open Deck Plate Girder Bridges
On open-deck railroad bridges, the crossties (sleepers) are directly supported by the bridge superstructure and anchored with deck tie fasteners such as hook bolts. These fasteners provide lateral resistance for the bridge ties. Currently there are no provisions to assist in the calculation of …
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Essays in public finance and labor economics
… outcomes by exploiting the arrangements of railroad tracks in the 19th century to isolate plausibly exogenous variation in a city's susceptibility to segregation. I show that, conditional on miles of railroad track laid, the extent to which track configurations physically subdivided cities …
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Deep Learning Methods for Built Environment Operational Management
… trade-off, using a real-world case study of railroad track monitoring. By leveraging repeated inspection data, employing standalone discriminator models trained solely on normal time series samples, and using kernel density estimation for probabilistic AD, DEGAN achieved a balanced F1 score …
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Prestressed concrete railway crosstie support variability and its effect on flexural demand
The increased presence of instrumentation on railroad track components in revenue service operation has provided vast amounts of data with the potential for improving the current modeling of track systems. The continuous improvement of components and track design depends on fine-scale optimization …
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Feature Extraction Workflows for Urban Mobile-Terrestrial LiDAR Data
… near transportation corridors, such as along a railroad track or a street. This thesis examines geovisualization for improving user-oriented workflows and also examines geographic object-based image analysis (GEOBIA) for the development of automated feature extraction. A LiDAR sensor-centric …
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Discrete element modeling of railroad ballast using imaging based aggregate morphology characterization
Ballast is an essential layer of the railroad track structure, and provides primarily drainage and load distribution. In general, ballast aggregates are considered as uniformly graded, angular shaped with crushed faces. However, various ballast aggregate gradations and particle shapes are in use …
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Development of ice-bonded ballast in sub-freezing temperatures and its effect on maintenance operations during a winter rail break
… in ice formation within the ballast layer of railroad track. Given the proper moisture and fouling conditions, the retained moisture bonds ballast particles together changing the mechanical properties. For above-freezing temperatures, longitudinal track resistance (f0) to restrain the track …
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Railway ballast permeability
… as a major structural and drainage component of railroad track, but is known to degrade over time. This progressive degradation increases the amount of finer particles within the ballast over time, called fouling material, which decreases its drainage capacity and strength. Railroads commonly …
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