The Sm4 is designed for longer-distance trips than typical metro-like local services.
The Sm4 units have largely replaced the older Sm1 and Sm2 units on commuter services from Helsinki to Riihimäki and Lahti.
The units are also used in commuter traffic on the Tampere–Riihimäki and Riihimäki–Kouvola routes.
The Sm4s were also  used for the shorter, frequently-stopping services because of the lack of more suitable low floor trains.
The new Sm5 low floor trains that started to enter commercial service in November 2009 have completely replaced the Sm4 units in  the short routes.
The Sm4 is designed for longer-distance trips than typical metro-like local services. The Sm4 units have largely replaced the older Sm1 and Sm2 units on commuter services from Helsinki to Riihimäki and Lahti. The units are also used in commuter traffic on the Tampere–Riihimäki and Riihimäki–Kouvola routes. The Sm4s were also  used for the shorter, frequently-stopping services because of the lack of more suitable low floor trains. The new Sm5 low floor trains that started to enter commercial service in November 2009 have completely replaced the Sm4 units in  the short routes.
VR Class Sm4