Another rumor is that it was a signal failure due to which the trains were halted and all the stations were shut. It took more than 3 hours for the passengers traveling to and fro from Nakheel Harbour to the Airport station.
Nevertheless, Dubai Metro is certainly an achievement and will definitely contribute to the development of the emirate.
Maybe the passenger wanted to indicate to the 'driver' to stop at the next station, like how they'd hit the bell on a bus to get it to stop at the next bus stop!
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