in this paper, the main factors in the analysis of the railway concrete sleepers areinvestigated and new recommendations are made in order to improve the accuracy of the currentpractices in analysis of the railway track system. first, a comprehensive literature survey isconducted, then, fem models for a railway track system are developed and used to discuss andevaluate the assumptions commonly ...

At the beginning of 1820s. Marc Seguin and his brothers started negotiations with French government for the construction of a railway line from the Saint-Etienne coal field to the Rhone valley and the city of Lyon. This railway is the first French railway using locomotives. Because there are few papers and publications on the history of this important railway, the writers have studied about the...

Wheel slip activity detection is crucial in railway maintenance, as it can contribute to avoiding wheel damage but also track deteriorations leading significant maintenance costs, trains delays, well the risk of accidents. characterised by lower adhesion between and wheel, especially braking conditions, locking wheels. It complex model or predict, being influenced a multitude factors including ...

Abstract In railway network, friction is an important factor to consider in terms of the service behaviors wheel-rail system. The objective this study was investigate effect a solid modifier (FM) environment. This achieved by studying friction, wear, and rolling contact fatigue (RCF) damage on materials at different slip ratios. results showed that when FM applied, coefficient decreased. After ...

in this article, multiple-product pvrp with pickup and delivery that is used widely in goods distribution or other service companies, especially by railways, was introduced. a mathematical formulation was provided for this problem. each product had a set of vehicles which could carry the product and pickup and delivery could simultaneously occur. to solve the problem, two meta-heuristic methods...

This paper proposes two quantitative criteria for removing railroad wheels from service, based on real-time structural health monitoring trends that are developed using data collected from trains while in-service. The data is collected using Wheel Impact Load Detectors (WILDs). These impact load trends are able to distinguish wheels with a high probability of failure from high impact wheels wit...

Let r(G,H) be the smallest integer N such that for any 2-coloring (say, red and blue) of the edges of Kn, n > N there is either a red copy of G or a blue copy of H . Let Kn − K1,s be the complete graph on n vertices from which the edges of K1,s are dropped. In this note we present exact values for r(Km −K1,1,Kn −K1,s) and new upper bounds for r(Km,Kn−K1,s) in numerous cases. We also present som...

Various stresses add to the railway rails and accumulate fatigue damage due to daily use. Fracture mechanics clarification concerning the growth behavior of cracks is needed, in order to decide the inspection period and the cycle [1], . Though the crack progression and influence of residual stress on fatigue strength has been researched [3] for many years, they are not clear now. The aims of th...