You're looking at platforms number 1 and 11 with the Grindelwald station building at the WAB end-of-track. The Berner Oberland Bahn (BOB) on the left has two tracks while the WAB has two on the right. According to the departure board the BOB is running a 30 minute service between here and Interlaken Ost, the other end destination. Now why would the WAB number there track as 11? (Uppercase letters designate the sector. A chart near a station indicates which cars will be located in each sector. Usually First Class in sector A, Second Class in B, etc. but it varries.) Having sectors for the WAB seems rather pointless though. However, this is the standard method of labelling platforms throughout Switzerland.