These walls exist whereupon there are no fewer than nine different service advisories. Some say the same thing but for different dates. The trick is finding the one pertaining to your train and the date it is happenning. Still though it can be quite daunting. Also there are times I get confused when it says one train replaces another train because I wonder if it means that an express is now local or something like that. This is something I feel like you never see in movies that take place in the future, regular maintenance.