Autors: BANIĆ, M., Purgic, S. P., MILTENOVIĆ, A., Slavchev, S. S., Maznichki, V. Y. Title: LIGHTWEIGHT DESIGN OF HIGH SIDED OPEN FREIGHT WAGON SERIES Eamno Keywords: ightweight design , f reight wagon , FEM , topology, optimi z ation Abstract: This paper is dedicated to lightweight design of high sided open freight wagon series Eamno, type 159. Design strength was calculated in Department of Railway Engineering at Technical University Sofia and tested at the Bulgarian National Transport Research Institute (NTRI) in 2015. In the same year German railway administration commissioned the wagon. The results of carried out strength calculations show, that the wagon’s construction has very high strength and stiffness. The conclusion from calculations is that wagon construction could be optimized in order to reduce wagon’s own weight and in that way to increase maximal payload capacity of the wagon by keeping the wagon body strength in prescribed limits. The result of the precalculations is that the construction of Eamno 159 is oversized due to massive mid solebar, bolsters and transoms. Those elements of wagon underframe have immense impact on own weight of entire wagon body. References Issue

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