In the United States, the freight railway industry is already running without much excess capacity. Hence, better planning and scheduling tools are needed to effectively manage the scarce resources, to cope with the rapidly increasing demand for railway transportation. The integration of freight train and passenger train scheduling and dispatching is an important railroad management task since ...

To enhance the stability of continuous welded rail (CWR) tracks, frictional sleepers have been developed. The are new types with grooves on bottom, and different bottom improve lateral resistances at magnitudes. In this study, single sleeper push test (SSPT) its model discrete element method (DEM) were carried out to confirm how much arrowhead groove (AGF) increases resistance ballasted track. ...

Lateral resistance of railway track is one of the most important parameters in lateral stability. This parameter depends!on the conditions of different components of ballasted railway track (such as density of ballast layer, sleeper spacing, type of sleeper, etc.). From this perspective, type of sleeper has an important effect on lateral resistance. However in some conditions, in technical and ...

The dynamic performance of a railroad vehicle as related to safety is evaluated in terms of specific performance indices like ride quality. The ride quality is interpreted as the capability of the railroad vehicle suspension to maintain the motion within the range of human comfort and or within the range necessary to ensure that there is no damage to the cargo it carries. The recent trend in dy...

Crumb rubber (CR) has been proposed to apply in the ballast or sub-ballast layer for degradation mitigation and vibration (noise) reduction. The CR can change stiffness, which affect train-track-subgrade dynamic performance cause travel comfort safety issues. Towards this, this study aims at confirming 1) how much application of train layer; 2) what extent CR-ballast distribute loadings reduce ...

Ballast is a porous layer that reduces the effective contact surface between sleeper and ballast. Also, does not have smooth bottom surface, which causes reduction of ballast particles. At field experiments, by installing sensitive papers under sleepers track, cyclic load was imposed passing trains, after certain amount loads, pressure paper removed, measured while in laboratory investigation, ...

In order to assess pressure distributions within the track and support structure, earth pressure cells have been installed in selected hot mix asphalt (HMA) trackbeds on a CSX Transportation heavy tonnage revenue freight line and at the TTCI heavy tonnage test track at Pueblo. The measured values of pressure distribution within each layer were used to establish a pressure index. This pressure i...

This study develops an integrated data-driven and model-driven approach (template matching) that clusters the urban railroad point clouds into three classes of rail track, contact cable, and catenary cable. The employed dataset covers 630 m of the Dutch urban railroad corridors in which there are four rail tracks, two contact cables, and two catenary cables. The dataset includes only geometrica...

Abstract In this paper, a dynamic interaction model of the coupled system railway bridge, foundation, subsoil, ballast, track, and high-speed train is presented, with special emphasis on longitudinal between track bridge structure, taking into account flexibility ballast. After description system, equations motion are given separately for each subsystem. The discretization bedded rails performe...