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Revision of limit value for longitudinal forces in the train |
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Safety requires a limitation of the permissible longitudinal force exerted on the locomotive by the following cars. For some loco-hauled trains, this is a critical restriction for the use of regenerative braking. A more differentiated concept for the limit values for longitudinal forces could remove this barrier.
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Technology field: Regenerative braking and energy management
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General information
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Description
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Safety requires a limitation of the permissible longitudinal force exerted on the locomotive by the following cars. If too much braking power is supplied by the locomotive, the heavy freight cars exert critical forces on the braking locomotive which lead to dangerous lateral forces in curves. Therefore maximum longitudinal forces are defined limiting the use of dynamic brakes. In many cases, this is a limitation for regenerative braking since in loco-hauled stock the only powered axles are located in the locomotive. Therefore these limitation values can restrict the use of dynamic brakes in situations where adhesion would still allow for it. In most countries, the limit values do not depend on the individual train mass. Instead, the “worst case” (e.g. heavy freight train) is taken to define the limit value for all trains irrespective of their mass (usually 150 kN). A more differentiated concept for these limit values would increase the recuperation potential in lighter trains (light freight trains or loco-hauled passenger stock). SBB has introduced such a concept (cf. General criteria - Example). |
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General criteria
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Environmental criteria
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Economic criteria
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Application outside railway sector (this technology is railway specific)
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Overall rating
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References / Links:
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Attachments:
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Related projects:
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Contact persons:
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date created: 2002-10-09 |
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© UIC - International Union of Railways 2003 |
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