Is reservation required in Golden Pass from Brienz to Interlaken Ost if we have an Eurail Select pass?

I am taking Golden pass train from Interlaken Ost to Lucerne and had already made the reservation for the same. I have a Eurail Select Pass. I am planning to take Golden pass train the previous day from Brienz to Interlaken Ost after boat ride in Lake Brienz. Do I need compulsory reservation for this short distance also? Please respond.
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