Time to scatter stones, and time to collect stones. Strange activity on the railroad

I have seen a lot of activities with people near the railway over the years of filming, but such a meaningless activity is the first time.
After all, sitting on a dirty rail is already a dubious pleasure. And throwing stones from one place to another is doubly pointless. Perhaps you know the purpose of this? Write your opinion in the comments.
Diesel locomotive 2M62U-0069A / 0248A with a freight train on the Yarmolintsy - Dunaevtsy stretch
Khmelnitsky region, Ukraine
2021-06-27 12:41:15