Some of the tallest and most inspiring structures in Asia and the world can be found along the Huangpu River bank in Pudong's Lujiazui District.
However, you want the main shop not the window.
During the time the train was in the station and shortly before, the toilets on board are all locked so it's a good idea to go before the train pulls into a station.
Photos courtesy of Alistair Weaver.
Of course, you'll end up travelling with other western tourists rather than actual Vietnamese people, which you may consider an advantage or disadvantage depending on your point of view.
You can also buy northbound Hanoi to Nanning tickets at but in this case tickets will need to be collected in China.