Personally I would be using planes instead of trains because of the crisis in Europe you really need to keep it in mind. Boarders can close at anytime and trains are frequently patrolled by the army. It's also not safe at the moment especially with little kids. My Aunty was on a train to Amsterdam that was stopped in Germany and the train was cancelled on the spot. Things can change in the next 12 months but you need to keep it in mind when planning a trip.