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It’s already mapped on OpenStreetMap as under construction so it’s visible as a dashed pink line on OpenRailwayMap: https://www.openrailwaymap.org/?style=standard&lat=46.53991223176021&lon=6.5935564041137695&zoom=14
Holy crap TIL about open railway map. Thanks, I always was annoyed how google showed highways and not railways when you zoom out.
I mostly like the “maximum speeds” view!