VR Class Sm1

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VR Class Sm1
Sm1 units at Helsinki central railway station.
The renovated interior of an Sm1.
The renovated interior of an Sm1.
Manufacturer Valmet
Constructed 1968–1973
Entered service 1969–2016
Refurbishment 1994-2000
Number built 50
Fleet numbers 6001+6201 – 6050+6250
Capacity 191 passengers
Operator(s) VR Group
Line(s) served Helsinki commuter rail
Train length 53,250 mm (174 ft 8 in)
Car length 26,625 mm (87 ft 4.2 in)
Maximum speed 120 km/h (75 mph)
Weight 58.6 t (57.7 long tons; 64.6 short tons) (Sm1)
94.2 t (92.7 long tons; 103.8 short tons) (Sm1+Eiob)
Axle load 18.8 t (18.5 long tons; 20.7 short tons)
Prime mover(s) Strömberg GHAU H7226
Power output 4x215 kW (288 hp)

The electric multiple unit Sm1 is a class of commuter train equipment that was in active use by the VR Group (Finnish Railways) from 1969–2016. Fifty Sm1 units were built between years 1968 and 1973 at Valmet airplane factory in Tampere.[1] It was put into use on the first electrified Finnish railway line between Helsinki and Kirkkonummi on January 26, 1969[2] with five units in operation. All Sm1 units were thoroughly renovated in the 1990s. Commercial service ended in April 2016.

Technical information[edit]

Each Sm1 unit consists of two cars, Sm1 actually being the class of the motored carriage in the two-car unit. The other car is called a driving trailer and its class is Eio .[2] The two-car unit has 191 seats combined, including fourteen foldable seats. 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. This is a major advantage compared to locomotive-pulled trains in commuter traffic.

Six Sm1 units can be coupled together, but trains in commercial traffic are limited to five units, because of the length of the station platforms.[citation needed] It is possible to see six Sm1 units coupled together during switching duties between the Ilmala depot and the Helsinki railway station. The units use Scharfenberg couplers.

The maximum speed of the unit is 120 km/h (75 mph). They are numbered between 6001/6201 and 6050/6250 (Sm1 car / Eio driving trailer). The electric systems were developed and built by Strömberg at their plant in Pitäjänmäki, Helsinki.

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

See also[edit]


  • Eonsuu, Tapio; Honkanen, Pekka; Pölhö, Eljas (1995). Suomen veturit osa 2. Moottorikalusto. Elokuvan Maailma. pp. 92–93. ISBN 952-5060-02-0. 

External links[edit]

Media related to VR Class Sm1 at Wikimedia Commons