Nowadays, metropolitan railway systems are in great demand, so they offer highfrequency services for the most part of the day. Therefore there are only a few hours during night available to carry out maintenance tasks. This research develops a system that records the vertical accelerations undergone by the bogies of in-service railway vehicles. As accelerations are measured during regular servi...

Hat geometrisi muayene araçlarıyla yapılan ölçümlerden elde edilen grafiklere göre demiryolu hattı yatay ve düşey düzlemlerde düzgün olmayan dalgalı bir geometriye sahiptir. Bu geometrik yapı fraktal desen olarak göz önüne alındığında hat geometrisinin düzgünsüzlüğü boyutlar yardımı ile sayısal ifade edilebilir. çalışmada Ankara-Eskişehir Yüksek Hızlı Tren (YHT) hattının düzgünsüzlüğünü belirle...

apart from regular wheel wear such as decreasing wheel diameters and reduced flange thicknesses and heights, wheel flats (wf) and oval wheels (or oor, out-of-roundness) are the most common wheelset problems for railway vehicles. within the fp7 research project “saferail”, apt has developed an innovative wheelset monitoring system so-called “wheel flat and out of roundness monitoring (worm) syst...

Concrete track slab and asphalt trackbed are being introduced in Korea for providing good bearing capacity, durability to the track and comfortable rideness to passengers. Such a railway system has been designed by the train load so as to ensure stability. But there is lack of research and design for temperature changes which influence the behavior characteristics of concrete and asphalt. There...

Indian railway is one of the largest networks in country. Its motto “the life line country”, and main transport completed by railways Railroad cheapest safest means transport, but there are also certain accidents on railroad. 60% caused road failures or formation cracks road. Today’s rail systems involve manual track inspection, which cumbersome not entirely effective. However, detection correc...

With the railway transportation Industry moving actively towards automation, accurate location and inventory of wayside track assets like traffic signals, crossings, switches, mileposts, etc. is of extreme importance. With the new Positive Train Control (PTC) regulation coming into effect, many railway safety rules will be tied directly to location of assets like mileposts and signals. Newer sp...