-  Technologies
    -  Projects
    Contact & Links
    Imprint & Disclaimer

back to list go back to project list      previous previous project  next project  next

    Optimised Ventilation Control Re 4/4 II, Re 4/4 III  

Project type:
Retrofit measure, Implementation into fleet



End in 2004

Project aims:
Energy savings by equipping old locomotives with demand-operated ventilation of traction equipment.

Application area:
294 vehicle(s)


A number of SBB locomotives Re 4/4 II and Re 4/4 III equipped with a two-speed ventilation system were retrofitted with an optimised control of the utilisation of the two speeds. The device is based on a simple computer calculating a hypothetical excess temperature in the traction motors on the basis of recorded currents and a measurement device for the oil temperature in the transformer. Threshold values automatically select one of the two ventilation speeds. As a result, full ventilation is used much less, leading to substantial energy savings.
The savings per locomotive and year add up to 70 MWh (all 294 engines approx. 21 GWh). The modification costs are CHF 5200.-- per locomotive. The order for modification of all 273 engines Re 4/4 II and 21 Re 4/4 III was placed. The first 73 engines were rebuilt until 04/30/2000. Each year further 30 engines will follow.

References / Links:
Related technologies:  Ventilation control (retrofit)
Contact persons:  Ulrich Toggenburger (Swiss Federal Railways (SBB), Division of Passenger traffic, Departement Rolling Stock Management)
 date created: 2003-02-28
© UIC - International Union of Railways 2003
 Your contribution
   add project
 Print options
   print screen