cheapest French train tickets?

knightstyle

We will be in France this summer and in August need to go from Poitiers to Metz, pick up two grandchildren and travel back next day.
So what is the best way? It is over six hours driving each way and wonder if there is any way we can do it cheaply on the train?

missbiggles1

How far in advance are you able to book?
What ages are the children?
Do you have any rail card?

knightstyle

We can book soon, children 12 and 14, only a UK disabled railcard and we will not be making any other train journeys in France.
Return is about 130€ each adult, standard fare.

Voyager2002

Check out The Man in Seat 61: last time I looked, his advice was to book French rail tickets through a site called Capitaine Train. There are some very good deals available to those who can book well in advance, but generally on routes to and from Paris.