I heard from locals this used to be a railway, perhaps some tags can be added.

Podle místních tudy vedla železnice, potenciálně je možné doplnit tagy

I believe gauge=1435;1520 mm ends in Mostiska 2.

Can someone confirm it?

On the ground, it looks like this path does not exist anymore.

Am Ort sieht es so aus als ob es den Weg nicht mehr gäbe.

Does this spur really have voltage of 3000 V?

Here they refer to the place in Italian as Forcella S. Silvestro, not S. Silvester - perhaps the name is wrong on the map?
https://www.valgardena-active.com/it/attivita/dalla-forcella-piza-all-arco-di-roccia-dello-stevia-parco-naturale-puez-odle-5680

I don't think this is Lavertezzo as relation 1684693 suggests

Mediterranean Steps lead closer to the rock (November 2019).

I have recorded and uploaded two GPS tracks covering a part of the new(?) route. The rest is missing because I realised the inconsistency too late.

Some map layers show Mar da Palha as water, some as land. Why?