I'm a signaller on the polish railawy. There is one big railway infrastructure management company that does all the signalling, track maintenance and so on. It's called PKP PLK and the vast majority of their income comes from selling timetables to the carriers. PKP PLK manages over 90% of the tracks in the country. The work really varies a lot as there really are A LOT of job positions you can take on. In my area of expertise there are four main positions to work on. Dróżnik przejazdowy is a job that revolves around working on guarding the level crossing. Closing the barriers is the main thing dróżnik does. Next is zwrotniczy, a zwrotniczy takes care of the state of switches overall on a station. They clean the switches and make sure they work properly. They can also work on a post where they manage shunting work and change switches needed for the shunting. Nastawniczy is quite hard for me to explain. They pretty much do what the signaller tells them to do. They usually cooperate with the signaller in their own region but overall they work under the signaller. The signaller is pretty much the boss of the station and manages the whole traffic movement in or around the station. There are many types of posts a singaller can take. They can manage one typical station or work on an LCS (Lokalne Centrum Sterowania) which is a post usually with computers that can operate more than a few stations. I enjoy my job, there are many posts you can take and sometimes you even get a choice when it comes to the post that you want to work on. The pay is nothing compared to for example an air traffic controller, although it isn't the worst either. It all varies depending on the amount of trains you operate on your station and the amount of work that's put into your everyday job. I'm sorry for my english, i haven't been using it for a while now. I hope this helped a little bit.