In February 2022, the ISO/TC 269 Technical Committee for Railway Applications published a draft ISO 22163 Rail Applications – Railway Quality Management System – ISO 9001:2015 and detailed requirements for use in the railway industry.

The new standard is intended to replace the existing technical specification ISO/TS 22163:2017.
Link to ISO.ORG: https://www.iso.org/standard/79427.html

Concurrently, ISO/TC 269 is developing a document, designated ISO/AVII TR 8931, that defines the RQMS (Rail Quality Management System) conformity assessment model.
Link to ISO.ORG: https://www.iso.org/standard/83387.html?browse=tc

It is possible that both of these publications will be made available before 2022 ends.