The Chartres train line also goes thru Versailles in case you want to if not go inside palace walk around the grounds and parks (free) or make an appointment to go inside the palace. Versailles-Chantiers - mainline station in Chartres is about a mile or so south of the palace. Could be good for folks who just want to see cathedral in Chartres and get an early start.

But, Chartres has things other than the world-famous Gothic cathedral - nice pedestrian shopping area = restaurants of all types - other ancient churches and a Little Venise with a river lined with ancient facades and mills. And Picassiette's House is a world-famous example of naive art or art brut. A local street cleaner picked up shards of ceramic and other stuff off streets and fashioned his garden and interior of house with them into many things - including a mini Chartres cathedral. A really stunning place:

https://www.google.com/search?q=mais...ih=625&dpr=1.5

Picassiette's House is about a mile or so from the cathedral in an ordinary neighborhood. BTW Picassiette was a nickname give to this guy by children who said it in a mocking way - the feminized form of Picasso.