VR Class Dm7

---

title: "VR Class Dm7" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["valmet", "multiple-units-of-finland", "train-related-introductions-in-1954"] description: "Class of Finnish diesel multiple unit" topic_path: "general/valmet" source: "https://en.wikipedia.org/wiki/VR_Class_Dm7" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Class of Finnish diesel multiple unit ::

::data[format=table title="Infobox train"]

Field	Value
name	Dm6, Dm7
image	VR Class Dm7 in Jyvaskyla.jpg
imagesize	300px
caption	Dm7 multiple units at Jyväskylä railway station in 1987
service	1954–88
manufacturer	Valmet
yearconstruction	1954–63
numberbuilt	15 (Dm6)
197 (Dm7)
numberpreserved	21
fleetnumbers	4000–4014 (Dm6)
4020–4216 (Dm7)
capacity	64 passengers
operator	Valtionrautatiet
carlength	16660 mm
width	3100 mm
height	3400 mm
maxspeed	95 km/h, later 115 km/h
weight	15 –
engine	Valmet 815 D
poweroutput	130 kW
uicclass	(1A)(A1)dm
aarwheels	1A-A1
gauge
::

| name = Dm6, Dm7 | image = VR Class Dm7 in Jyvaskyla.jpg | imagealt = | imagesize = 300px | caption = Dm7 multiple units at Jyväskylä railway station in 1987 | interiorimage = | interiorimagealt = | interiorcaption = | service = 1954–88 | manufacturer = Valmet | factory = | family = | replaced = | yearconstruction = 1954–63 | yearservice = | refurbishment = | yearscrapped = | numberconstruction= | numberbuilt = 15 (Dm6) 197 (Dm7) | numberservice = | numberpreserved = 21 | numberscrapped = | formation = | fleetnumbers = 4000–4014 (Dm6) 4020–4216 (Dm7) | capacity = 64 passengers | operator = Valtionrautatiet | depots = | lines =

| carbody = | trainlength = | carlength = 16660 mm | width = 3100 mm | height = 3400 mm | floorheight = | platformheight = | entrylevelorstep = | doors = | art-sections = | maxspeed = 95 km/h, later 115 km/h | weight = 15 – | axleload = | acceleration = | deceleration = | traction = | engine = Valmet 815 D | poweroutput = 130 kW | transmission = | aux = | powersupply = | hvac = | electricsystem = | collectionmethod = | uicclass = (1A)(A1)dm | aarwheels = 1A-A1 | bogies = | brakes = | safety = | coupling = | multipleworking = | gauge = The Dm6 and Dm7 were diesel multiple units built by Valmet in the 1950s and 1960s for Valtionrautatiet. They are known by their nickname lättähattu (Finnish for "flat cap", the first widespread youth culture movement in Finland).

History

::figure[src="https://upload.wikimedia.org/wikipedia/commons/5/57/Lättähattu_VR_Dm7_sisältä.jpg" caption="Dm7 at the inside"] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/7/70/Dm7_at_Äänekoski.jpg" caption="A preserved Dm7 at [[Äänekoski]] station in 2011."] ::

At the beginning of the 1950s it became clear that VR needed multiple units to compete with buses in short-distance traffic. In 1952, seven Dm6s were ordered from Valmet, and eight more the next year.

After testing the Dm6:s and having noted that the new DMU:s worked well in Finnish conditions, VR ordered more units. In total, 197 Dm7 class multiple units were built with some modifications (a larger wheel size, for instance).

Variants

::figure[src="https://upload.wikimedia.org/wikipedia/commons/6/64/VR_Class_Dm7_”Lättähattu”_train.webm" caption="VR Class Dm7 recorded on 28 June 2018"] ::

DmG7

Three Dm7:s (numbers 4145–4147) were transformed into goods transport vehicles. They were withdrawn in 1981.

Ttv

16 Dm7:s were transformed into electric maintenance vehicles.

Preservation

All Dm6:s have been withdrawn from service. 20 Dm7:s are preserved by Finnish museum railway associations.

No:4020 is at the Finnish Railway Museum.

References

;Literature

References

1. "Dm7". Suomen Rautatiemuseo.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::