Feb 7, 2018 - 7:36 PM
in reply to kennethm
You'll need to take a route suggested by the timetable (link above) when you search for Basel to Wengen. Trains from Basel to Interlaken all go through Spiez - some have a change in Spiez while most are direct to Interlaken.
You can see the route and the towns the train goes through on the timetable - just click the + sign to expand.