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   Diesel-mechanic transmission  evaluated  
Diesel-electric and diesel-hydromechanic transmission are dominant in modern diesel stock. However technological progress in mechanical transmission has increased interest in diesel-mechanic stock in recent times.
Technology field: Optimisation of traction technologies
close main section General information
  close sub-section Description
   

In the second half of the 20th century diesel-electric and diesel-hydraulic stock has widely replaced older diesel stock with mechanical transmission. With advances in gear technology, some manufacturers and operators are recently starting to rediscover diesel-mechanic propulsion for reasons such as low price, low weight and high efficiency.

Manufacturer

  • Ansaldo Breda (IC4 for DSB)
  • Siemens (Desiro)
  • Bombardier (Talent)
  • etc.
open main section General criteria
close main section Environmental criteria
  open sub-section Impacts on energy efficiency:
  Energy efficiency potential for single vehicle: > 10%
  Energy efficiency potential throughout fleet: 1 - 2%
  Other environmental impacts: neutral
close main section Economic criteria
  close sub-section Vehicle - fix costs: low
    Diesel-mechanic transmission is roughly three times cheaper than hydro-mechanic transmission.
  Vehicle - running costs: significant reduction
    Compared to other transmission systems, mechanic transmission substantially reduces energy costs but increases maintenance costs. No figures are available, but it is expected that there is still an overall reduction running costs.
  Infrastructure - fix costs: none
    (no details available)
  Infrastructure - running costs: unchanged
    (no details available)
  Scale effects: high
    In many cases, scale effects can be exploited by using "off-the-shelf" solutions from automotive mass markets (busses and trucks).
  Amortisation: (no data)
    According to DSB, diesel-mechanic stock has equal or lower LCC than diesel-hydraulic stock.
close main section Application outside railway sector
  open sub-section Status of development outside railway sector: in use
  Time horizon for broad application outside railway sector: now
  Expected technological development outside railway sector: dynamic
  Market potential outside railway sector: high
open main section Overall rating
References / Links:
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 date created: 2002-11-10
 
 
© UIC - International Union of Railways 2003
 
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