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ISO RailDax (ISO/TS 4398:2022) is a data format used for data exchange between IT applications used for railway service planning.

The RailDax initiative is initiated and led by Jernbanedirektoratet with support from Standard Norge and international experts. The standard was published 13.9.2022.

The purpose of the RailDax standard is to facilitate for planning of railway operations between organisations in the transportation sector.

RailDax is based on proven railML experience during the previous 20 years and is developed as a twin to railML2.5.

The standard ISO TS4398 can be purchased at ISO or Standard Norge.

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