I was disappointed... (minor spoilers) The title had me hoping for some kind of futuristic world with trains and alienated people in a world of robotic efficiency. Instead, I had 2+ hours of a Chinese man with a mustache and a blinking problem. Chow must have blinked more than a billion times in this film. Rather annoyingly "cabotin", especially when compared to the (very) good performance of the other actors.
Also, why was Chow's character so damn macho? How can we believe that a rather small, oily, slug-mustached feller with no money and hillariously toad-like can go frolicking about with the superb women playing the female roles? My WSD was ironically suspended every time the plot started exploring a new relationship. And the man's supposed to be a writer, therefore at least somewhat sensible to other people's feelings and stuff. The scene where he hands the girl money after their first night together will have you cringe, both because of the contradiction with the presumed characterisation of Chow and with the impossibility to punch him in the throat.
Apart from that, it was unnecessarily long; at one moment it made me think of those Grandpa Simpson stories that go on and on ladden with boring details that no one will ever care about.
Now, the spoiler: Did Lulu die? From what I gathered, Chow rents the 2046 room after her death in it, at the hotel. Years after, around the time his ex-neighbour/lover is leaving for Singapore, he sees Lulu again. How/why? Is it a poetic licence or did I just miss something? Anyway, I rated this film a six, for the beautiful photography and the hope for a brighter future provided by LG electronics.
Thank you LG electronics! (art film, eh? first and last sequences were as blatantly commercial as publicity can be).