Hong Kong subway trains collide amid new signal system trials March 17, 2019 at 09:59PMhttps://https://ift.tt/2Fksu3q Two trains collide during a new signal system trial, threatening travel disruption for millions.

Two trains collide during a new signal system trial, threatening travel disruption for millions.

from BBC News - World https://ift.tt/2TKuvP2