VR series Sm2

from Wikipedia, the free encyclopedia
Sm2 + Eioc
VR Sm2 6X86 Tkl 2015-01-07.jpg
Numbering: 6051-6100 (Sm2)
6251-6300 (Eioc)
Number: 50
Manufacturer: Valmet , Strömberg
Year of construction (s): 1975-1981
Axis formula : Bo'Bo '
(+ 2'2' control car)
Gauge : 1524 mm
Length over buffers: 53,250 mm
Trunnion Distance: 18,900 mm
Fixed wheelbase: 2500 mm ( bogie )
Total wheelbase: 21,400 mm each
Service mass: 77 t
Top speed: 120 km / h
Driving wheel diameter: 920 mm
Impeller diameter: 920 mm (control car)
Power system : 25 kV 50 Hz
Power transmission: Overhead line
Number of traction motors: 8th
Drive: electric
Seats: 2 × 100
Classes : 2nd Class

From 1975 to 1981 the Finnish State Railways VR procured a total of 50 electric multiple units of the Sm2 series for use in regional traffic and for local rail traffic in the Helsinki region . The term Sm is derived from the Finnish word for electricity ( s ähkö) and railcar or motor vehicle ( m oottorivaunu ).

Technical details

As with the predecessor series Sm1 , Valmet manufactured the cars in Tampere and Strömberg supplied the electrical systems. By using aluminum instead of steel, the weight could be reduced from 94 to 77 tons compared to Sm1. The railcars always run with a control car from the Eioc series. Both vehicles have 100 seats each. Each of the four axles of the railcar is driven by an electric motor Strömberg GHAU / H 7224, which results in a drive power of 620 kW per train.


Between 2002 and 2011 the cars were completely overhauled and modernized in order to be able to use them until the 2020s. Multiple units of the series Sm4 and Sm5 ( FLIRT ) were procured for suburban traffic from Helsinki . The Helsinki Transport Association ( HSL ) announced on June 8, 2017 that the last Sm2 local trains will be replaced by FLIRT rolling stock from June 19, 2017.

The Sm2 are now used in local traffic on routes such as Riihimäki - Tampere and Riihimäki - Lahti - Kotka .


Another redesign is planned for the series. Sm2 6074 was towed together with Sm2 6071 from Joensuu to Ilmala on October 24, 2019 , where they had been parked since October 17, 2016. Now the benches and the flooring have been renewed and the interior lighting has been replaced by LED lights. There was also a new paint job in green / white. On May 25, 2020, the train unit took a test drive from Ilmala to Kerava and back. On June 4, 2020, the unit was again used in regular service to Riihimäki . All railcars of the Sm2 series are to undergo this redesign.

Web links

Commons : VR Class Sm2  - collection of images, videos and audio files

Individual evidence

  1. HSL Bahnverkehr switched to FLIRT (in Finnish)
  2. Sm2 6074 ... In: Resiina . 2020, accessed on August 5, 2020 (Finnish, issue 2020/02).