arrive in Paris June 4th at 2:00 PM. Need to get to amboise and see train from CDG at 4:20PM and 6:00 pm. since we land at 2:00 we do not think we have enough time to go through customs, etc for the 4:20. If we buy tickets for the 4:20 and do not make it, do we have to buy new tickets for the later train? I also see you need to get on a local train at St Pierre Des Corps. Are there taxis instead to go to amboise from St Pierre. I am concerned if we are on the 6:00 train we will get to amboise after 9:00 pm. Or is there a bus service, sort of like the National Express Bus service out of Heathrow that goes to Amboise or even Tours. New to Paris and the Loire valley and would appreciate any help.