Do you want to file a complaint against a railway company (except for fines)? You need to do the following:
Contact the railway company within 3 months after the journey. Use the complaint form provided by the railway company. The railway company has to answer to your complaint within one month.
If the dispute cannot be settled by contacting the railway company and if the railway company is based in the EU, Norway, Iceland or the United Kingdom, please feel free to contact the European Consumer Centre Germany.