Capturing the wind energy of trains

    My idea is to capture the wind a train generates as it speeds down the track, using that untapped force to create electricity.
    Several devices would be placed between the rails of either railway or subway lines. Each device would contain a turbine to gather the otherwise wasted wind energy and harnesses it to produce electricity.
    The cylindrical devices would be installed on the tracks below ground level on busy rail lines, where they should be able to gather enough wind to produce a reasonable amount of power.