This map is an experiment mapping different things that may create new meaning when seen on a map. Currently, it only has data on a few railway accidents, but keep visiting, more is planned.
If you deselect the category railway accidents, you will be able to see the different kinds of accidents according to their individual colors.
Feel free to write your suggestions in the comments. Also, if there are any railway accidents currently not mentioned, please feel free to tell me, so that I can add them in.