We booked for 1-way Hanoi>Lao Cai VIP Cabin, the process of exchange physical tickets very smooth. The VIP Cabin is very clean, beds are comfortable & air-cond strong. We managed to put our luggage bag underneath our beds. Though the ride was rough & rocky, we managed to hv few hours sleep. Four person cabin is very congested & have problem to store the luggage.
Hanoi has 2 railway stations, please go to "Ga Ha Noi" (for trains to the North) located at Tran Quy Cap Street.