दिल्ली मेट्रो की बड़ी कामयाबी, गोल्डन लाइन पर सबसे गहरी टनल का काम पूरा।

https://aliyesha.com/sub/articles/news/display/nd_metro_golden_line_deep_tunnel_work

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Downtown LA Bunker Hill. The barriers at the couplings between units are an interesting health and safety feature. Ot significantly slows down the entry of the train in the station as it needs to brake accurately while there's no ATO.

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