Currently new suburban trains for the operating company Norwegian State Railways are being delivered. The innovative EMU Class BM72 four-unit electric train sets should replace the existing operational EMU Class BM69 ...Currently new suburban trains for the operating company Norwegian State Railways are being delivered. The innovative EMU Class BM72 four-unit electric train sets should replace the existing operational EMU Class BM69 three-unit electric train sets which have been in service for more than almost 40 years. Hence, a renewal of the suburban train fleet seemed to be necessary. Due to the design, the new four-unit electric train sets have unusually high axle loads being used as suburban train for passenger traffic. As an average, the EMU Class BM72 train sets have axle loads which are approximately 22-25 percent higher than axle loads of the existing EMU train sets of class BM69. Hence, this paper will discuss the consequences concerning rail stresses and track deterioration tendencies with respect to a total replacement of the BM69 sets to the BM72 sets. Approved hand tool calculation methods found in the literature will be applied in order to calculate the stresses. Further will works completed by the ORE- committee D 161 be applied regarding considerations with respect to track damages. In this case, relative comparisons between EMU Class BM72 and EMU Class BM69 will be carried out.展开更多
文摘Currently new suburban trains for the operating company Norwegian State Railways are being delivered. The innovative EMU Class BM72 four-unit electric train sets should replace the existing operational EMU Class BM69 three-unit electric train sets which have been in service for more than almost 40 years. Hence, a renewal of the suburban train fleet seemed to be necessary. Due to the design, the new four-unit electric train sets have unusually high axle loads being used as suburban train for passenger traffic. As an average, the EMU Class BM72 train sets have axle loads which are approximately 22-25 percent higher than axle loads of the existing EMU train sets of class BM69. Hence, this paper will discuss the consequences concerning rail stresses and track deterioration tendencies with respect to a total replacement of the BM69 sets to the BM72 sets. Approved hand tool calculation methods found in the literature will be applied in order to calculate the stresses. Further will works completed by the ORE- committee D 161 be applied regarding considerations with respect to track damages. In this case, relative comparisons between EMU Class BM72 and EMU Class BM69 will be carried out.
