The electric multiple unit Sm1 is a class of commuter train equipment that was in active use by VR from 1969–2016.

[1] They were put into use on the first electrified Finnish railway line between Helsinki and Kirkkonummi on January 26, 1969[2] with five units in operation.

There is a driver's cabin at either end of the unit, which enables the train to be driven in both directions without turning it around.

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

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