Improvements were made to the algorithms used for earthquake early warning, followed by tests to validate their performance for actual use. The upgraded algorithms are capable of producing more accurate and timely estimations of seismic parameters, compared with current algorithms. This new technique contributes to raising train operating safety during earthquakes. Another enhanced algorithm was devised for seismographs installed along railway lines, which makes them capable of discriminating between earthquake motion and train-induced vibrations. These improvements to the seismographs are expected to increase the reliability of earthquake early warning.