One month travel ga card

Is it free to travel the mountain train from Interlaken Dong Station to Schinigeplate with One Month Travel Ga Card?

Welcome to the SBB Community.

Whether the GA, no matter the one month or the yearly pass, is valid, can be obtained from the validity map:

The GA grants a reduction but the ride not completely free.

Keep in mind that Schynige Platte is only open during the summer time.

Kind regards,
Roland