Serbia awarded China Railway 21st Bureau Group to build the 3,3 kilometre long tunnel "Tunnel No 4" on the Stalac-Junis railway.

The contract is worth 40,8 million dinars and does not include electrification, tracks, signaling and telecommunications.

In mid-2022 there is another tender and it will be for tunnels 1,2,3,5 according to Danas.

https://www.danas.rs/vesti/ekonomija/potpisan-ugovor-za-izgradnju-33-kilometra-dugog-tunela-na-pruzi-stalac-djunis/