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   Demixing of railway infrastructure  evaluated  
At present many railway lines have a mixed operation, i.e. trains with big speed differences run on the same lines. In an effort to increase capacity without investing in additional infrastructure, infrastructure operators try to “demix” their infrastructure by restricting trains to specific tracks according to average speed. Improved traffic fluidity may reduce energy consumption.
Technology field: Energy efficient driving
close main section General information
  close sub-section Description
   

Currently many railway companies operate on a mixed infrastructure, i.e. trains with big speed differences (e.g. freight and high speed passenger trains) run on the same tracks. This has a number of drawbacks: low capacity, additional infrastructure costs for passing lanes etc.

Therefore infrastructure operators try to “demix” their infrastructure by restricting trains to different tracks according to average speed. Figure 1 shows (in a very simplified manner) the principle of line demixing and the consequent increase in line capacity.

This can be a way to increase system capacity without investing in new infrastructure, thus lowering specific infrastructure costs.

Presently many railways recur to temporal demixing, i.e. freight trains running during night hours, passenger trains during day-time. In many cases, the spatial demixing described here is however a much better and much more customer-friendly strategy.

Figure 1: Principle of line demixing and capacity effect (simplified)

Demixing1.gif

Source: IZT

open main section General criteria
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:  Fricke et al. 2000;  Fricke, Janiak 1996;  Ilgmann 1998
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 date created: 2002-10-09
 
 
© UIC - International Union of Railways 2003
 
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