VR Class Sm4

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VR Class Sm4
VR Sm4 6422 Helsinki.JPG
Sm4 unit at Helsinki Central station.
Sm4 lähijuna sisältäpäin.jpg
Sm4 passenger compartment interior.
ManufacturerCAF, Fiat Ferroviaria, Alstom
Entered service1999
Number built30
Formation2 cars
Fleet numbers6301+6401 – 6310+6410 (1998-99), 6311+6411 – 6324+6424 (2004), 6325+6425 – 6330+6430 (2005)
Operator(s)VR Group
Car length26,450 mm (86 ft 9 in)
Width3,240 mm (10 ft 8 in)
Height4,400 mm (14 ft 5 in)
Floor height580 mm (22.8 in)
Platform height550 mm (21.7 in)
Doors4 per side
Maximum speed160 km/h (99 mph)
Weight114 t (112 long tons; 126 short tons)
Power output1,200 kW (1,609 hp)
Electric system(s)25 kV 50 Hz AC catenary
Current collection methodPantograph
Track gauge1,524 mm (5 ft)

The Sm4 electric multiple unit (EMU) is a low-floor train used by the VR Group in Helsinki commuter rail services. The initial order was for ten EMUs with the first unit entering service in 1999. Another 20 units were ordered in 2002 and the deliveries were completed in 2005. The Spanish company CAF was contracted to manufacture the units.[1]


The Sm4 EMU consists of two powered cars, each equipped with a pantograph. The unit is capable of regenerative braking and can thereby save up to 30% of the electrical energy that would otherwise be consumed. The maximum speed is 160 km/h.[2] The unit offers a good level of passenger comfort with a quiet and smooth ride quality. The Sm4 passenger compartments are fitted with air conditioning, CCTV cameras and display screens that can be used to show e.g. route information.[3] The units have partly low floors with all of the entrances at platform level, and they are equipped with toilets accessible to the disabled. There are racks for bicycles in the entrance vestibules nearest to the driver's cabins. Trains are usually formed of two units, but also only one and up to four in the peak hours, when traffic is too high to increase capacity by higher frequency of trains. This allows for a flexible handling of varying passenger traffic. The maximum number of connected units is five.


Sm4 on the Kerava-Lahti railway line

The Sm4 is designed for longer-distance trips than typical metro-like local services. The Sm4 units have largely replaced the older Sm1 and Sm2 units on commuter services from Helsinki to Riihimäki and Lahti. The units are also used in commuter traffic on the Tampere–Riihimäki and Riihimäki–Kouvola routes. The Sm4s were also used for the shorter, frequently-stopping services because of the lack of more suitable low floor trains. The new Sm5 low floor trains that started to enter commercial service in November 2009 have completely replaced the Sm4 units in the short routes.


Some railway enthusiasts use the nickname Pupu ("Bunny") for Sm4.


  1. ^ "Sm4 Trains for VR Finnish Railways: General description". CAF. Retrieved 20 July 2011.
  2. ^ "Sm4 Trains for VR Finnish Railways: Performance". CAF. Retrieved 20 July 2011.
  3. ^ "Sm4 Trains for VR Finnish Railways: Equipment". CAF. Retrieved 20 July 2011.

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