VR Class Sm2

The Sm2 is a class of electric multiple units in use by VR in commuter traffic in the Helsinki area. Fifty Sm2 units were built between 1975 and 1981 by Valmet in Tampere.

VR Class Sm2
Refurbished Sm2 interior
ManufacturerValmet
Constructed1975–1981
Entered service1975–
Refurbished2001–2011
Number built50
Fleet numbers6051+6251 – 6100+6300
Capacity200 passengers
Operator(s)VR Group
Line(s) servedHelsinki commuter rail
Specifications
Train length53,250 mm (174 ft 8 in)
Car length26,625 mm (87 ft 4.2 in)
Maximum speed120 km/h (75 mph)
Weight46.5 t (45.8 long tons; 51.3 short tons) (Sm2)
76.0 t (74.8 long tons; 83.8 short tons) (Sm2+Eioc)
Axle load15.9 t (15.6 long tons; 17.5 short tons)
Prime mover(s)Strömberg GHAU H7226
Power output4x155 kW (208 hp)

All Sm2 units were completely renovated between 2001 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, modern toilets and a new livery.

Technical information

Like the Sm1, each Sm2 unit consists of two cars: the Sm2 is the motored car of the multiple unit, while the other car, the driving trailer, is a part of the Eioc class.[1]

The units are numbered from 6051 to 6100 for the Sm2 motored car and 6251 to 6300 for the Eioc driving trailer.

The train can be driven from both ends, which is a major advantage compared to locomotive-pulled trains in commuter traffic. Sm2's can be coupled together with Sm1's forming trains of at most six units (12 cars), but the length of the commuter train platforms limits the maximum length to five in commercial traffic. The full length trains can be seen in depot traffic in the morning and evening. The units use Scharfenberg couplers.

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 bodywork is also made of aluminium, as opposed to steel in the Sm1.

The maximum speed of the unit is 120 km/h (75 mph). The electric systems were developed and built by Strömberg at their plant in Pitäjänmäki, Helsinki.

References

Literature
  • Eonsuu, Tapio; Honkanen, Pekka; Pölhö, Eljas (1995). Suomen veturit osa 2. Moottorikalusto. Elokuvan Maailma. pp. 94–95. ISBN 952-5060-02-0.CS1 maint: ref=harv (link)

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