With the "EDITH Bahn-Signale Lern" app, you can use the card index principle to practice the relevant signals according to guideline 301 "Signal Book" of DB Netz AG, which you need as an operating employee in the locomotive, in shunting or train attendant service or other activities in railway operations . Then check your knowledge in the quiz. In this you can test all signals by random selection or sort them according to application areas. This means: The signals are grouped together as they occur in practical operating situations. This way you learn the signals in context and not stubbornly by heart!