Just as in Saigon, Hanoi is a dense city where, outside of downtown, little attention was paid to details like infrastructure planning. This can result in some impactful visuals such as this video of a train traveling through a narrow alley.
The train makes its way through the tight path every day at 4pm and 7pm, barely clearing houses and motorbikes. As there have been accidents in the past, residents seclude themselves in their homes as the train passes by.