VR Class Sm4
Electric multiple unit
title: "VR Class Sm4" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["multiple-units-of-finland", "25-kv-ac-multiple-units", "caf-multiple-units", "alstom-multiple-units", "alstom-coradia", "train-related-introductions-in-1999"] description: "Electric multiple unit" topic_path: "general/multiple-units-of-finland" source: "https://en.wikipedia.org/wiki/VR_Class_Sm4" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Electric multiple unit ::
::data[format=table title="Infobox train"]
| Field | Value |
|---|---|
| name | VR Class Sm4 |
| image | 15-12-21-Helsingin päärautatieasema-RalfR-N3S 3312.jpg |
| imagesize | 300px |
| caption | 2 refurbished Sm4 units side by side at Helsinki Central station. |
| interiorimage | SM4 Matkustamo.jpg |
| interiorcaption | The interior of a refurbished Sm4 unit |
| stocktype | Electric Multiple Unit |
| manufacturer | CAF, Fiat Ferroviaria, Alstom |
| family | Coradia |
| yearconstruction | 1998–2005 |
| yearservice | 1999 |
| refurbishment | VR Hyvinkää workshop (2013–2016) |
| numberbuilt | 30 |
| formation | 2 cars |
| fleetnumbers | 6301+6401 – 6310+6410 (1998-1999), 6311+6411 – 6324+6424 (2004), 6325+6425 – 6330+6430 (2005) |
| capacity | 192(+8) seats + 100 standing places |
| operator | VR Group |
| carlength | 26.45 m |
| width | 3.24 m |
| height | 4.4 m |
| floorheight | 580 mm |
| platformheight | 550 mm |
| doors | 4 per side |
| maxspeed | 160 km/h |
| weight | 114 t |
| traction motors | 2 × 600 kW |
| poweroutput | 1200 kW |
| electricsystem | catenary |
| collectionmethod | Pantograph |
| uicclass | B′2′+2′B′ |
| safety | ATP-VR/RHK |
| gauge | |
| :: |
| name = VR Class Sm4 | image = 15-12-21-Helsingin päärautatieasema-RalfR-N3S 3312.jpg | imagealt = | imagesize = 300px | caption = 2 refurbished Sm4 units side by side at Helsinki Central station. | interiorimage = SM4 Matkustamo.jpg | interiorimagealt = | interiorcaption = The interior of a refurbished Sm4 unit | stocktype = Electric Multiple Unit | service = | manufacturer = CAF, Fiat Ferroviaria, Alstom | factory = | family = Coradia | replaced = | yearconstruction = 1998–2005 | yearservice = 1999 | refurbishment = VR Hyvinkää workshop (2013–2016) | yearscrapped = | numberconstruction = | numberbuilt = 30 | numberservice = | numberpreserved = | numberscrapped = | formation = 2 cars | fleetnumbers = 6301+6401 – 6310+6410 (1998-1999), 6311+6411 – 6324+6424 (2004), 6325+6425 – 6330+6430 (2005) | capacity = 192(+8) seats + 100 standing places | operator = VR Group | depots = | lines = | carbody = | trainlength = | carlength = 26.45 m | width = 3.24 m | height = 4.4 m | floorheight = 580 mm | platformheight = 550 mm | entrylevelorstep = | doors = 4 per side | maxspeed = 160 km/h | weight = 114 t | acceleration = | deceleration = | traction motors = 2 × 600 kW | poweroutput = 1200 kW | transmission = | aux = | powersupply = | hvac = | electricsystem = catenary | collectionmethod = Pantograph | uicclass = B′2′+2′B′ | bogies = | brakes = | safety = ATP-VR/RHK | coupling = | multipleworking = | gauge = The Sm4 electric multiple unit (EMU) is a low-floor train used by the VR Group for its VR 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, based on a design by Fiat Ferroviaria (later acquired by Alstom). The train has the nickname of pupu, meaning ‘bunny’.
Features
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. 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. 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.
Routes
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 on HSL commuter rail routes.
File:Sm4 6313 Sääksjärvellä 2025.jpg|Sm4 train with a refreshed passenger information system on a main line service File:Sm4 lähijuna sisältäpäin.jpg|Sm4 old inside design File:VR-6402-Hel.jpg|Sm4 train in 2001 VR Class Sm4 with doors open in Helsinki.jpg|Sm4 entrance
References
References
- "Sm4 Trains for VR Finnish Railways: General description". CAF.
- https://vaunut.org/kuva/172098?tt=4&i1=Sm4
- "Sm4 Trains for VR Finnish Railways: Performance". CAF.
- "Sm4 Trains for VR Finnish Railways: Equipment". CAF.
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