There are these 2 self-documented in French
- FR:Tag:railway=platform_marker - OpenStreetMap Wiki
- FR:Tag:railway=platform_section - OpenStreetMap Wiki
The opposite by showing what each *:carriages= aligns with using the =stop + =stop_position might be easier in some sense Proposal:Platform exits - OpenStreetMap Wiki
We haven’t agreed on it. I don’t like adapting exit= and mixing everything in exit:carriages=* , having suggested to move them into different destination:*:carriages=