UIC IRS 90940 - edition 2: SFERA protocol

UIC Sectors and Stakeholders approval

Welcome and thank you for taking the time to consider this document.

What is SFERA?

SFERA is intended to facilitate the use of Connected Driver Advisory Systems (C-DAS) for interoperable traffic by standardising the data exchange between on-board systems and Traffic Management Systems (TMS). The scope includes both ERTMS/ETCS Limited Supervision and Class B train protection systems. The format is also useful for Standalone DAS (S-DAS) by standardising data interfaces between Infrastructure Managers and Railway Undertakings.

Moving to edition 2 of the IRS 90940

After the publication of edition 1, the SFERA working group worked on improving the protocol and solved issues that could prevent an efficient implementation, also thanks to the feedback from the SFERA user group.

This approval is the first step towards external to the working group parties for the publication of the IRS 90940 in its edition 2.

Approval process

This draft IRS 90940 was endorsed by the SFERA Working Group last 15 March 2022.

You are kindly requested to give feedback via mail to UIC Advisors by clicking here,

before 18 April 2022, at latest.

Please submit your comments using the templates inside the first archive.
[IRS 90940 Stakeholder Review Comment Template.xslx] file for comments on the IRS and appendices.

Deadline to submit: 18 April 2022


You can read through the IRS by downloading it here:
WARNING: You will need to extract it with the password provided via the announcement mail.


- Zip - 14.5 Mb


You will find a file for any comment you would want to submit in this phase.


- Excel - 16.9 kb


Thank you!

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Tuesday 15 March 2022