The Sm2 is a class of electric multiple units in use by VR in its commuter rail traffic in southern Finland.

Many of the changes are visible to the passengers, including a different type of seat and modern toilets.

The Sm2 is technically very similar to the older Sm1 EMU, although there are also some differences, such as the Sm1 having steel spring suspension and strengthening creases on the sides.

The electric systems were developed and built by Strömberg at their plant in Pitäjänmäki, Helsinki.

In September 2022, VR sold 11 units already removed from service to private company Suomen Lähijunat [fi] Oy, which plans to overhaul the ageing units and put them back into use on new commuter routes in the Turku region.