We are a couple planning to visit Interlaken from Paris in June. We decided to book the Paris to Basel journey via TGV and then Basel to Interlaken through Local trains. Given are the details of the train and the ticket we are trying to book:
18/06/2015 10:23 PARIS GARE LYON
18/06/2015 13:26 BASEL SBB
TGV Duplex Lyria 9211 - Reservation included
18/06/2015 13:31 BASEL SBB
18/06/2015 15:22 INTERLAKEN WEST
Train Eurocites 1073 - Reservation not included
Important! You have less than 20 min connection time.
We advise families, tourists and elderly to make sure they have at least 45 min when changing trains within the same station.
If you think you may require more, you can book journeys separately and choose the train times that best suit you.
QUERY: The time required to change between the trains at BASEL is 6 mins. Is it sufficient to change the train in such a less amount of time? If not and we miss the train to Interlaken, is it possible to take the same train a while later for Interlaken with the same tickets?
I would say it is risky to buy such ticket. Swiss trains are usually on time (even though there are exceptions as in everything), but the same doesn't always happen in France. Strikes and works on the lines are current on the french side and you should take that in consideration.
I don't know Basel train station well, but in other main cities in Switzerland where the TGV stops there is a special section of the station for these international arrivals with a passport control for some nationalities. If that's the case in Basel, you might need at least 10 minutes to exit this international sector in order to reach the domestic lines.
Unless it is specified on the ticket that it is possible to use another train in case of missing the 13h31 one, i would take two separate tickets to be sure!
WIsh you happy travels!
I'm not 100% sure about this particular instance, but usually the policies are that if you miss your train you can still board any other train departing in the following 30 minutes. That is, of course if you haven't bought a nonrefundable or nonexchangeable ticket.