This library and simple console tool for it will try to convert the Railroads Online UE4 save game file into a JSON for easier analysis.
Back convertion is theoretically possible, but is not implemented.
The simple convertor included will produce two JSON files in same folder where *.sav file is. One is more or less exact copy of data as they are saved in *.sav file - named <sav_name>.orig.json The other one is converted to more human readable form - called <sav_name>.better.json