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Any queries on the RSSB response must be received by this date.

Consultation Summary

The current process for determining clearances from the rolling stock to structures and to other rolling stock is based on swept envelopes and assessment methods using reference, comparative or absolute gauging techniques which are set out in a suite of RSSB gauging standards and guidance notes. These methods are applied to achieve clearances that avoid potential fouling between the infrastructure and rolling stock. However, where worst-case tolerances for the rolling stock and infrastructure are combined, the results can be over-conservative and lead to the identification of modifications to rolling stock and/or infrastructure that impose additional costs, potentially delaying the introduction of rolling stock on routes. 

The application of a probabilistic gauging technique that associates a probability to the likelihood of fouling could be used to avoid unnecessary changes to infrastructure and realise important cost savings. Probabilistic gauging techniques are currently available to use in the GB rail industry, calculating more representative clearances than current absolute gauging methodologies. RSSB is creating a brand new Rail Industry Standard (RIS) setting out a consistent industry method for probabilistic gauging in response to a Request for Help (RfH).

The new RIS will provide a standard industry approach for the application of Monte Carlo methods in probabilistic gauging assessments. It sets out the scope, process, input and outputs of the method and provides guidance to support consistent application.

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