I have to agree on this one..... I play a lot less since the DLC is out because the Katowice / Krakow part is pretty dead now. It's just way more fun when you can communicate with other players, especially signal boxes.
A special note to the devs: this is the first train simulator with advanced multiplayer. You are far ahead on this part in comparison with TSW or other trainsims. Don't let the game and servers die... It would really be a shame as this is one of the best train sims IMO.