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   Common Rail  evaluated  
Whereas in conventional diesel engines injection pressure is generated for each injector individually, a common rail engine stores the fuel under high pressure in a central container ("common rail") and delivers it to the individual injectors on demand. Benefits of common rail injection are reduced noise levels, stronger performance, improved emission control and greater efficiency.
Technology field: Optimisation of traction technologies
open main section General information
open main section General criteria
open main section Environmental criteria
close main section Economic criteria
  close sub-section Vehicle - fix costs: low
    Depends on power class and engine charcteristics. In general common rail is a mature technology which is comparable in price to other engines (at least in the automotive sector).
  Vehicle - running costs: significant reduction
   

The reduction of running costs depend on point of reference but is generally considerable. If old engines are replaced, both fuel consumption and maintenance efforts are substantially reduced.

The total diesel-engine-related costs are typically composed as follows (Source: Günther 1998):

  • Costs for fuel and lubricants: 65 %
  • Maintanace costs: 15 %
  • Initial investment: 20 %

This gives an idea of the economic relevance of fuel consumption.
  Infrastructure - fix costs: none
    (no details available)
  Infrastructure - running costs: unchanged
    (no details available)
  Scale effects: medium
    Common rail technology in high power classes is still rare. Therefore certain scale effects are to be expected if appreciable numbers are ordered.
  Amortisation: not applicable
    Payback times obviously depend on application context. Re-engining measures typically pay off in about 5 years.
open main section Application outside railway sector
open main section Overall rating
References / Links:  Günther 1998;  www.siemensvdo.com
Attachments:
Related projects:
Contact persons:
 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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