Ss 544-1 Pdf
Mirtha Hinrichs
Braking performance can be expressed via a braked weight or via decelerations. This is scope o the UIC Leaflet 544-1 Brakes - Braking performance. The leaflet details the conversion of the braked weight to the braked weight percentage of a vehicle or train for operating purposes. Reference is also made to limiting features arising during operational application of the braked weight percentage of a train calculated from the vehicles' specified braked weight, for different train formations.
Braking performance is defined based on a number of standardised conditions (e.g. gradient) and a mean in-service vehicle condition. Brake assessment thus currently does not assume the worst possible vehicle condition, which may be the result of e.g. braking force tolerances, friction coefficient scatter, downgraded efficiency etc. It led to the conclusion to update UIC leaflet on Brakes and Braking performance.
By default the brake assessment is made using the brake position "P". However, the leaflet also indicates reference values for stopping distances which can be obtained in the brake position "G". The assessment curves are presented as graphs and in mathematical terms.
The assessment in the shape of a braked weight is valid for trains and individual vehicles at speeds up to 200 km/h. Assessment via decelerations is valid only for trains, though irrespective of speed.
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