The thing that monitors the what thing???

Just as anyone might wonder, why is there a funny-looking box at the local MRT station? I drew myself closer to this box and read off the words on a sticker pasted on the grey box... Hmmm, a Automatic Tunnel Monitoring System, it said on it.

What does it monitor? Just the tunnel? Or train, or speed, or to see anyone trying to jump off the track and it will sort of jam-brake the train at FULL ultimate force!!?? Well at the end of the day, my train came and goes....

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