The train is principally used by the BLS AG on Bern S-Bahn services, four units (525 038-041) belong to RegionAlps.

The articulated trainset was designed to be built with from two to six sections and with two to six motorized axles.

[2] The RABe 525 is used on the following routes: Between 2015 and 2019, BLS modernised its entire Nina fleet.

A standing area was created in 2nd class and the colour scheme inside and outside the vehicles was standardised so that all trains have the same design.

Later, "Wankdorf" was added as a stop and "Konolfingen" was the first place with a coat of arms.