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   Single-axle bogies  evaluated  
Due to the significant share of bogies in overall train mass, single-axle running gear can make an appreciable contribution to mass reduction. Curve-steered bogies with self-steering wheelsets (KERFs) are a mature single-axle solution for local and regional trains.
Technology field: Mass reduction
open main section General information
close main section General criteria
  close sub-section Status of development: (no data)
    (no details available)
  Time horizon for broad application: 5 - 10 years
    (no details available)
  Expected technological development: highly dynamic
   

The new Copenhagen S-trains show that single-axle running gear of the KERF type are a mature technology. There is however still considerable potential for further technological development, especially as far as the self-steering concept is concerned. There are many possible lanes of future development going far beyond the KERF concept, especially in the field of mechatronically controlled running gear.
    Motivation:
    Mass reduction
  Benefits (other than environmental): medium
   

Mass reduction

Besides reduced energy consumption, weight reduction leads to higher acceleration rates for given traction power (or less traction power to be installed for a given acceleration rate).
  Barriers: medium
   

Technological maturity

KERFs being a relatively new technology with only one train type running in regular service (Copenhagen S-train), there is still some scepticism about the reliability of the concept.
    Success factors:
    (no details available)
  Applicability for railway segments: (no data)
    Type of traction:  electric - DC, electric - AC, diesel
    Type of transportation:  passenger - main lines, passenger - high speed, passenger - regional lines, passenger - suburban lines, freight
    Single-axle concepts have potential in many types of trains. It is however obvious that due to lower train weight the short-term potential is especially high in local and regional operation. This is also the area with highest energy efficiency effects (cf. Environmental criteria - Energy efficiency potential).
    Grade of diffusion into railway markets:
  Diffusion into relevant segment of fleet: < 5%
  Share of newly purchased stock: < 20%
    (no details available)
  Market potential (railways): medium
    (no details available)
    Example:
    Copenhagen S-trains
open main section Environmental criteria
open main section Economic criteria
no data available Application outside railway sector (this technology is railway specific)
open main section Overall rating
References / Links:  Lenhard 2000
Attachments:
Related projects:  The purchase of the new Copenhagen S-trains
Contact persons:
 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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