Hi all, I wrote this proposal focused on power conversion in traction substations. https://wiki.openstreetmap.org/wiki/Proposed_features/Traction_substations_extension
It is proposed to use a new key conversion=* to indicate which kind of power conversion operates inside a substation. As explained in rationale, no voltage=* nor frequency=* can be used as reliable information to deduce it at the substation scale. conversion=no explicitly means no power=converter device will be found in the substation perimeter (for instance, high speed lines modern 25kV AC traction systems) This is an occasion to improve Paris railway substations mapping which expose a few different situations 63 kV AC => 1500 V DC 63 kV AC => 25 kV AC 225 kV AC => 25 kV AC Feel free to add opinions and concerns in Talk page All the best François
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