My parents travelled in SHM-HYB Special last week. The train was running late by 3 hours and it stopped for 1 min instead of 5 mins at BBS and my family struggled to board B1 in which there were 20+ people boarding from BBS.
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I was under the impression that guard keeps an eye on doors and gives signal when people have boarded. But I guess they do not do it anymore. Once a guard had told me that they do this at short stoppages.