We are a group of 6 persons who will be staying in Paris in August for a week. We intend to take a day's trip to Loire Valley, starting with the metro from La Motte Picquet - Grenelle to Gare Montparnasse and then to Tours.
a) What does the broken line mean from Pasteur metro, one stop before Gare Montparnasse?
b) How much will a return trip by train cost from Gare Montparnasse to Tours as prices on the Loire Valley forum vary?
c)Which website indicates the train ticket prices?
d) Do we have to book the train seats in advance?
e) Which is the best means of transport to reach Chennonceau Castle?
Much obliged for any replies.