China is strongly dependent on railway transportation. but the frost heaving of the subgrade in cold regions has seriously affected the safety and comfort of trains. Moisture content is an essential parameter in the subgrade frost heave. Non-destructive and efficient geophysical methods have great potential in measuring the moisture content of railway subgrade. https://www.roneverhart.com/Liftmaster-K1D8387-1CC-Expansion-Circuit-Board/