I would say go to the website and try to book the trip ( http://www.sncf.com/ or if you search these forums you'll find there are ways to use English if need be to book) because if trains show up for that day it means they'll be running. The most likely answer is yes they will, but you should also check what the closings will be in Chartres with their tourism website. Paris Tourism site has this list for Paris and area but I'm afraid I glanced and did not see Chartres covered there. …parisinfo.com/3117-museums-and-monuments-op…
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