Bernese Oberland Pass

I am planning to use the Bernese Oberland Pass. I want to go from Luzern to Interlaken. Do I need to book a separate ticket for that section?

The Luzern to Interlaken (via Brünig) line which is operated by Luzern Interlaken Express is covered by the Bernese Oberland Pass, too.

Have you seen the validity map available as download from the Bernese Oberland product website?

Kind regards,
Roland