If you refer to the bell shown on the beginning of the video, it's main purpose is to warn crossing guardsman that he must lower the gate (as a train is about to pass the grade crossing). Such warning bells are actually dates back from Dutch East Indies period, but nowadays they became outdated due to the installation of communication phone network etc, as well as increasing number of train traffic on main lines.
You're welcome! Just an addition: in reality the sound emitted from warning bells are having different meaning, depending on how the station staff operates the lever for activating that warning bell from station office (either it could means downward or upward trains, as well as warning the guardsman that there is an extraordinary condition, etc).
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