Rolling stock

Junakalusto Oy has procured in total 81 city trains i.e. Sm5 trains for the commuter train traffic of the metropolitan area.

Sm5 city trains were delivered by a Swiss company Stadler Bussnang AG. The brand name given by Stadler to these EMUs is Flirt that is an abbreviation for Fast Light Innovative Regional Train.

Sm5 train

The new commuter trains improve the travelling comfort in the commuter traffic of the metropolitan area significantly. It is easy to access the low-floor train also by passengers travelling with a pram or bicycle or using a wheelchair. Moving inside the train is also easy because the trains do not have doors between the vestibules and passenger compartments. It is easy to find a vacant seat in the spacious interior.

The commuter trains are air-conditioned and have electronic displays for passenger information. Air curtains have been installed in the door-side panels and they operate in cold weather. Air curtains prevent ingress of cold air to the vestibule when the entrance doors of the train are open. Additionally, the trains are equipped with a heat recovery system that is unique in Finland.

The length of the Sm5 train is 75 metres. A train in operation can be composed of three train units at the maximum.

In total, more than thousand Flirt trains delivered by Stadler are in operation worldwide, mainly in different parts of Europe. Junakalusto Oy’s train unit No.58 was the thousandth Flirt train delivered by Stadler. The train has been modified regarding the track gauge and technology so that it fits for the track network and demanding weather conditions in Finland. Stadler has used also Finnish expertise in the modification work since the beginning of the design.


Technical data

  • bright, passenger-friendly interior with customized design
  • excellent visibility trough the whole passenger area
  • low-floor section > 70%
  • passenger information system
  • spacious multipurpose area in entrance section
  • 6 doors on each side for fast passenger ingress/egress
  • air-conditioned passenger and driver compartments
  • vacuum toilet system, also suitable for persons with reduced mobility
  • ergonomically designed driver's cab
  • fibre class reinforced front section
  • automatic coupler
  • welded superstructure built with extruded aluminium profiles
  • air-suspended motor and trailer bogies
  • redundant traction chain; 4 converters with water-cooled IGBT-modules
  • vehicle control system with train bus and diagnostic computer
  • CCTV system
  • multiple traction, maximum 3 train units

Train data

Customer Junakalusto Oy, Finland
Operation area Train traffic in the metropolitan area and in southern Finland
Track gauge 1‘524 mm
Type code Sm 5
Supply voltage 25 kV, 50 Hz
Axle arrangement Bo' 2'2'2' Bo'
Number of trains 81
Putting into service 2009/2010
Seating capacity 232
Fold-up seats 28
Standing capacity (4 pers./m2) 323 (according to DIN 25008)
Floor height Low floor 600 mm
High floor 1‘120 mm
Door width 1‘300 mm
Longitudinal strength 1‘500 kN
Overall length 75‘200 mm
Vehicle width 3‘200 mm
Vehicle height 4‘400 mm
Weight in running order 132 t
Bogie wheelbase Motor bogie 2‘700 mm
Trailer bogie 2‘750 mm
Powered wheel diameter, new 860 mm
Trailer wheel diameter, new 800 mm
Continuous power at wheel 2‘000 kW
Maximum power at wheel 2‘600 kW
Starting traction effort 200 kN (47 km/h)
Starting acceleration 1.2 m/s2
Maximum operating speed 160 km/h