Companies which manage railway networks have to cope continually with the problem of operating safety and maintenance intervention issues related to rail surface irregularities. A lot of experience has been gained in recent years in railway applications but the case of tramways is quite different; in this field there are no specific criteria to define any intervention on rail surface restoratio...

Many researchers have long observed some cases in which certain ranking irregularities can occur when the original analytic hierarchy process (AHP), or some of its variants, are used. This paper presents two new categories of ranking irregularities which defy common intuition. These ranking irregularities occur when one decomposes a decision problem into a set of smaller problems each defined o...

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During this past summer, I had the rare (at least to the academician) opportunity to personally visit and travel with over 30 agribusiness salesmen throughout much of the American Southwest. I accompanied many of these “mobilized merchants” on their customer service calls. I rode along with these “practicing scientists” in their pickup trucks as they checked their clients’ operations for agrono...

Transportation Research Record: Journal of the Transportation Research Board, No. 2374, Transportation Research Board of the National Academies, Washington, D.C., 2013, pp. 190–200. DOI: 10.3141/2374-22 C. T. Rapp, M. S. Dersch, J. R. Edwards, and C. P. L. Barkan, Rail Transportation and Engineering Center, Department of Civil and Environmental Engineering, University of Illinois at Urbana–Cham...

This paper presents a novel design concept of low-cost permanent monitoring system for rail-track problems. The introduced is theoretically overcome the currant in-use designs in terms providing accurate observations detecting irregularities all railway network during service time using integrated sensors. investigates common by identifying issues, presenting challenges, and highlighting limita...

This study aims to identify parametric models estimate track irregularities in high-speed railways with simple acceleration measurements. The primary contribution of current research is the development effective smaller parameters. These parameters are derived from measured data via a specialized geometry inspection system. An adaptive Kalman filter algorithm, using displacement estimated signa...

Tracks are critical and expensive railroad asset, requiring frequent maintenance. The stress from heavy car axle loads increases the risk of deviations uniform track geometry. Irregularities in geometry, such as warping, can cause an excessive harmonic rocking condition that lead to derailments, traffic delays, associated financial losses. This article presents approach enhance location identif...