The Dm6 and Dm7 were diesel multiple units built by Valmet in the 1950s and 1960s for Valtionrautatiet.[1] They are known by their nickname lättähattu (Finnish for "flat cap", the first widespread youth culture movement in Finland).[2]
| Dm6, Dm7 | |
|---|---|
 Dm7 multiple units at Jyväskylä railway station in 1987 | |
| In service | 1954–88 |
| Manufacturer | Valmet |
| Constructed | 1954–63 |
| Number built | 15 (Dm6) 197 (Dm7) |
| Number preserved | 21 |
| Fleet numbers | 4000–4014 (Dm6) 4020–4216 (Dm7) |
| Capacity | 64 passengers |
| Operators | Valtionrautatiet |
| Specifications | |
| Car length | 16,660 mm (54 ft 7 7⁄8 in) |
| Width | 3,100 mm (10 ft 2 in) |
| Height | 3,400 mm (11 ft 1 7⁄8 in) |
| Maximum speed | 95 km/h (59 mph), later 115 km/h (71 mph) |
| Weight | 15–18 t (14.8–17.7 long tons; 16.5–19.8 short tons) |
| Prime mover(s) | Valmet 815 D |
| Power output | 130 kW (170 hp) |
| UIC classification | (1A)′(A1)′dm |
| AAR wheel arrangement | 1A-A1 |
| Track gauge | 1,524 mm (5 ft) |
History
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At the beginning of the 1950s it became clear that VR needed multiple units to compete with buses in short-distance traffic.[3] In 1952, seven Dm6s were ordered from Valmet, and eight more the next year.[3]
After testing the Dm6:s and having noted that the new DMU:s worked well in Finnish conditions, VR ordered more units.[4] In total, 197 Dm7 class multiple units were built with some modifications (a larger wheel size, for instance).[4]
Variants
editDmG7
editThree Dm7:s (numbers 4145–4147) were transformed into goods transport vehicles. They were withdrawn in 1981.[5]
Ttv
edit16 Dm7:s were transformed into electric maintenance vehicles.[6]
Preservation
editAll Dm6:s have been withdrawn from service.[7] 20 Dm7:s are preserved by Finnish museum railway associations.[8]
No:4020 is at the Finnish Railway Museum.
See also
editReferences
edit- ^ "Dm7" (in Finnish). Suomen Rautatiemuseo. Retrieved 6 June 2011.
- ^ Kiiskinen & Ahonen 1996, p. 123.
- ^ a b Eonsuu, Honkanen & Pölhö 1995, p. 74.
- ^ a b Eonsuu, Honkanen & Pölhö 1995, p. 76.
- ^ Eonsuu, Honkanen & Pölhö 1995, p. 80.
- ^ Eonsuu, Honkanen & Pölhö 1995, p. 111.
- ^ Eonsuu, Honkanen & Pölhö 1995, p. 75.
- ^ Eonsuu, Honkanen & Pölhö 1995, p. 77.
- Literature
- Eonsuu, Tapio; Honkanen, Pekka; Pölhö, Eljas (1995). Suomen veturit osa 2. Moottorikalusto. Elokuvan Maailma. pp. 74–80, 111. ISBN 952-5060-02-0.
- Kiiskinen, Kyösti; Ahonen, Seppo (1996). Rautahevon kyydissä: Junamatka Matin ja Liisan päivistä Pendolinoon. Gummerus. pp. 123–124. ISBN 951-20-4900-7.
External links
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Media related to VR Class Dm7 at Wikimedia Commons- Finnish Railway Museum
- Steam Locomotives in Finland Including the Finnish Railway Museum
