On weekends, especially in the evenings, groups of tourists walk or sit at cafes along both sides of the train tracks in Hanoi. The busiest are the shops along the train tracks south of Hanoi station.
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Source: https://tuoitre.vn/video/khach-nuoc-ngoai-van-me-tit-check-in-ca-phe-duong-tau-o-ha-noi-160263.htm