VR Class Dm7
{{short description|Class of Finnish diesel multiple unit}}
{{Infobox train
| 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 = {{convert|16660|mm|ftin|frac=8|abbr=on}}
| width = {{convert|3100|mm|ftin|frac=8|abbr=on}}
| height = {{convert|3400|mm|ftin|frac=8|abbr=on}}
| floorheight =
| platformheight =
| entrylevelorstep =
| doors =
| art-sections =
| maxspeed = {{convert|95|km/h|abbr=on}}, later {{convert|115|km/h|abbr=on}}
| weight = {{convert|15|–|18|t|1|abbr=on}}
| axleload =
| acceleration =
| deceleration =
| traction =
| engine = Valmet 815 D
| poweroutput = {{convert|130|kW|abbr=on}}
| transmission =
| aux =
| powersupply =
| hvac =
| electricsystem =
| collectionmethod =
| uicclass = (1A){{prime}}(A1){{prime}}dm
| aarwheels = 1A-A1
| bogies =
| brakes =
| safety =
| coupling =
| multipleworking =
| gauge = {{Track gauge|1524mm|lk=on}}
}}
The Dm6 and Dm7 were diesel multiple units built by Valmet in the 1950s and 1960s for Valtionrautatiet.{{cite web | url = http://www.rautatie.org/web/fi/gallerydet.asp?id=1§ion=1 | title = Dm7 | publisher = Suomen Rautatiemuseo | language = fi | access-date = 6 June 2011 }} They are known by their nickname lättähattu (Finnish for "flat cap", the first widespread youth culture movement in Finland).{{sfn|Kiiskinen|Ahonen|1996|p=123}}
History
File:Dm7 at Äänekoski.jpg 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.{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=74}} In 1952, seven Dm6s were ordered from Valmet, and eight more the next year.{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=74}}
After testing the Dm6:s and having noted that the new DMU:s worked well in Finnish conditions, VR ordered more units.{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=76}} In total, 197 Dm7 class multiple units were built with some modifications (a larger wheel size, for instance).{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=76}}
Variants
= DmG7 =
Three Dm7:s (numbers 4145–4147) were transformed into goods transport vehicles. They were withdrawn in 1981.{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=80}}
= Ttv =
16 Dm7:s were transformed into electric maintenance vehicles.{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=111}}
Preservation
All Dm6:s have been withdrawn from service.{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=75}} 20 Dm7:s are preserved by Finnish museum railway associations.{{sfn|Eonsuu|Honkanen|Pölhö|1995|p=77}}
No:4020 is at the Finnish Railway Museum.
See also
References
{{Reflist|30em}}
;Literature
{{refbegin}}
- {{cite book | first1 = Tapio | last1 = Eonsuu | first2 = Pekka | last2 = Honkanen | first3 = Eljas | last3 = Pölhö | title = Suomen veturit osa 2. Moottorikalusto | pages = 74–80, 111 | publisher = Elokuvan Maailma | year = 1995 | isbn = 952-5060-02-0 }}
- {{cite book | first1 = Kyösti | last1 = Kiiskinen | first2 = Seppo | last2 = Ahonen | title = Rautahevon kyydissä: Junamatka Matin ja Liisan päivistä Pendolinoon | pages = 123–124 | publisher = Gummerus | year = 1996 | isbn = 951-20-4900-7 }}
{{refend}}
External links
- {{Commons category-inline}}
- [https://web.archive.org/web/20110716115318/http://www.rautatie.org/web/en/default.asp Finnish Railway Museum]
- [http://www.internationalsteam.co.uk/trains/finland01.htm Steam Locomotives in Finland Including the Finnish Railway Museum]
{{Finnish locomotives}}
{{DEFAULTSORT:Dm7}}