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This study shows the use of Distributed Acoustic Sensing (DAS) to monitor seasonal changes in shear wave velocity (Vs) on a railway embankment in Southern England. Fibre optic cables were installed along a 350m long embankment, and active seismic surveys using hammer impacts were conducted from Aug 2022 to Aug 2023. DAS measurements, correlated with soil moisture and matric suction, showed good agreement between seasonal moisture fluctuations and Vs. During dry periods, Vs values were higher, while wetter conditions resulted in lower values, indicating reduced soil stiffness. The findings demonstrate DAS-based MASW as an effective, high-resolution alternative to traditional geophysical methods to monitor railway embankments.