Wheel flats induce high-impact loads with relevance for the safety of vehicle in operation as they can contribute to broken axles, hot axle boxes, and damaged rolling bearings wheels. The high also damage track components such rails sleepers. Although this subject has been studied numerically experimentally over last few years, wheel flat problem focused on ballasted tracks, there is a need und...

Abstract With development of the heavy-haul railway, increased axle load and traction weight bring a significant challenge for service performance safety maintenance railway track. Conducting defect recognition on concrete sleepers ballast using big data is vital. This paper focused detection absent sleeper support in ballasted track with an emphasis integration model-based data-driven methods....

• Geosynthetic Reinforced Soil with Retaining Wall (GRS-RW) vs conventional embankment. The experiments are carried out in a full-scale testing facility laboratory. Two track forms considered: three-sleeper concrete slab and ballasted track. GRS-RW structure showed good performance under both static cyclic loading. pressure levels found the experiment were compared against literature. This pape...

Nonlinear hunting speeds of railway vehicles running on a tangent track are analytically obtained using Hopf bifurcation theory in this paper. The railway vehicle model consists of nonlinear primary yaw dampers, nonlinear flange contact stiffness as well as the clearance between the wheel flange and rail tread. Linear and nonlinear critical speeds are obtained using Bogoliubov method. A compreh...

BACKGROUND Streetcar or train tracks in urban areas are difficult for bicyclists to negotiate and are a cause of crashes and injuries. This study used mixed methods to identify measures to prevent such crashes, by examining track-related crashes that resulted in injuries to cyclists, and obtaining information from the local transit agency and bike shops. METHODS We compared personal, trip, an...

We have developed a new theory for correcting track irregularities by applying their restored waveforms and carried out experimental levelling and lining work. In this theory, the optimum shifting/lifting values are obtained as solutions for a typical quadratic programming problem. Restrictions on shifting rails are formulated as constraint conditions of the optimization problem. Furthermore, i...

In this paper, analysis for reducing lateral forces is implemented by using a railway vehicle model on a sharp curved track. Also, in order to minimize some problems when a railway vehicle runs on a sharp curved track, an active-steering bogie system is investigated. An active steering bogie system of a railway vehicle is designed to alleviate contact forces and to decrease wear of wheel/rail i...