The BLS RABe 528, also known as MIKA,^{[lower-alpha 1]} is a passenger articulated trainset manufactured by Stadler Rail for BLS AG. It is a derivative of the Stadler FLIRT and began entering service in 2021.

BLS AG ordered 58 trainsets from Stadler Rail in 2017 at a cost of CHF 650 million. BLS planned to use the trains on Bern S-Bahn services and on longer RegioExpress services.^[3] The RABe 528 will replace locomotive-hauled Einheitswagen III [de] coaches and the RBDe 565 [de] and RBDe 565 [de] multiple units.^[4] The first trains entered service on 10 May 2021 on the InterRegio 66 between Bern and Neuchâtel.^[5]

Each formation is composed of six cars, with a maximum seating capacity of 275. They can accommodate another 200 standees. Altogether the formation is 104,900 mm (344 ft 1+15⁄16 in) long. Cars are 2,880 mm (9 ft 5+3⁄8 in) wide and 4,260 mm (13 ft 11+11⁄16 in) tall. The design speed is 160 km/h (99 mph). There are different internal layouts for longer-distance trains compared to S-Bahn trains but they are mechanically identical.^[1]