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Controlling freight rail noise at-source can be more effective than seeking to treat either the noise path or the receiver. This paper presents a framework for at-source noise control of freight rail noise. This framework is discussed in the context of the complete system through which the noise is generated, and explained through a case study focused on curve squeal. The application to curve squeal includes considerations of the track, the wheel-rail interface and the rolling stock. It is shown how addressing each system in parallel can not only mitigate curve squeal, but can also lead to the more efficient operation of the railway. Other primary freight rail noise sources are also discussed, and opportunities for addressing these impacts through the proposed noise control framework are outlined. These include locomotive exhaust noise, locomotive idling noise, brake squeal and bunching/stretching noise.

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