VR Class Dm7

Class of Finnish diesel multiple unit
16,660 mm (54 ft 7+7⁄8 in)Width3,100 mm (10 ft 2 in)Height3,400 mm (11 ft 1+7⁄8 in)Maximum speed95 km/h (59 mph), later 115 km/h (71 mph)Weight15–18 t (14.8–17.7 long tons; 16.5–19.8 short tons)Prime mover(s)Valmet 815 DPower output130 kW (170 hp)UIC classification(1A)′(A1)′dmAAR wheel arrangement1A-A1Track gauge1,524 mm (5 ft)

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]

History

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.[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

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 They were withdrawn in 1981.[5]

Ttv

16 Dm7:s were transformed into electric maintenance vehicles.[6]

Preservation

All Dm6:s have been withdrawn from service.[7] 20 Dm7:s are preserved by Finnish museum railway associations.[8]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

References

  1. ^ "Dm7" (in Finnish). Suomen Rautatiemuseo. Retrieved 6 June 2011.
  2. ^ Kiiskinen & Ahonen 1996, p. 123.
  3. ^ a b Eonsuu, Honkanen & Pölhö 1995, p. 74.
  4. ^ a b Eonsuu, Honkanen & Pölhö 1995, p. 76.
  5. ^ Eonsuu, Honkanen & Pölhö 1995, p. 80.
  6. ^ Eonsuu, Honkanen & Pölhö 1995, p. 111.
  7. ^ Eonsuu, Honkanen & Pölhö 1995, p. 75.
  8. ^ 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

  • Media related to VR Class Dm7 at Wikimedia Commons
  • Finnish Railway Museum
  • Steam Locomotives in Finland Including the Finnish Railway Museum
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