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This document gives requirements and guidance for the design and defines criteria for validation of the rolling stock and its constituents under specific environmental conditions to which this rolling stock will be subject. It also includes availability, reliability and safety aspects which are relevant for the daily operation and the correct functioning of the rolling stock in these environmental conditions. This document applies to: — self-propelling thermal or electric vehicles; — thermal or electric traction units; — passenger carriages; — mobile railway infrastructure construction and maintenance equipment (on-track machines are based on their specification). However, the requirements may be appropriate for other applications (such as freight wagons) that have similar operational conditions. The nominal range of the environmental parameters is described in the EN 50125-1:2014.