VR Class Sm2

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VR Class Sm2
An Sm2 unit at Helsinki.
Refurbished Sm2 interior
Manufacturer	Valmet, Strömberg
Built at	Tampere, Finland
Constructed	1975–1981
Entered service	1975–
Refurbished	2002–2011; 2018–2024
Number built	50
Fleet numbers	6051+6251 – 6100+6300
Capacity	200 passengers
Operators	VR Group
Lines served	VR commuter rail lines M, G, O, R & Z
Specifications
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	46.5 t (45.8 long tons; 51.3 short tons) (Sm2) 76.0 t (74.8 long tons; 83.8 short tons) (Sm2+Eioc)
Axle load	15.9 t (15.6 long tons; 17.5 short tons)
Prime mover(s)	Strömberg GHAU H7226
Power output	4x155 kW (208 hp)
Safety system(s)	ATP-VR/RHK
Multiple working	Sm1
Track gauge	1,524 mm (5 ft)

The Sm2 is a class of electric multiple units in use by VR in its commuter rail traffic in southern Finland. Fifty Sm2 units were built between 1975 and 1981 by Valmet in Tampere. Since the withdrawal of the older Sm1 units, the Sm2 units are the oldest multiple units in use in Finland.

All Sm2 units were completely renovated between 2002 and 2011. Only the bodywork and the technics remained mostly untouched. Many of the changes are visible to the passengers, including a different type of seat and modern toilets. Between 2018 and 2024, all remaining operational units were refreshed, with new moquette and a new livery consisting of a white bodyside with a green lower band, except for units 90 and 91, which remains in their vintage red livery.

Close-up of the number plate of Eioc trailer No. 6256, seen at Kotka Port in June 2022. This unit, like most nowadays, carries the newer white livery with green lower bodyside band.