Ok, thanks for the information!
We rode the trails in Hrastovača, they are great. I connected them to the current Peterova biciklistička staza, since they’re now linked by the tunnel under the railway, start right from there, and are ridden as a single track.
But my question was about the trail even further east, from Radanovačka šuma along Peščarina Street. I added almost all the segments, but for now I left it simply as a nameless MTB trail. I hope someone will give it the correct name someday.

I hvala za trejlove i putokaze, oni su odlični!