On the Character of Noise in the Railroad Freight-Car Classification Yard and Approaches to Noise Reduction

As a major part in railroad freight transmit in railroad classification yard. The "hump" and switches to classification tracks are major system in freightcar calssification. It is a kind of major noise source when freight cars go down through the mechanical car retarders, which are mounted on the "hump" grade tracks to prevent the cars rolling too fast in railroad freightcar classification yard. This article illustrate the acoustic character of this noise source, according to the observation and test contract in the noise reduction project in KUMING railroad eastern station. Some possible approaches to noise reduction are given.