Modern railway stations are often multi-level constructions. There is of course the tracks and platforms, but also – specifically near the larger cities – a collection of coffee shops, sandwich bars and other sundries stores. Add to that a (preferably monumental) entrance hall, public transportation and parking areas… That means the public transportation customer will have to find his/her way along stairs and escalators of all kinds and shapes.
It is no different in Liège-Guillemins. There’s mainly two levels: one for the trains, and one to enter and take care of shopping. But with the grand architecture (and as the station is built against a rolling hill) there’s access to surrounding walkways and balconies as well.
Click on the image(s) to see a larger version