With the “Learning Train Signals” app, you can practice the relevant signals in accordance with DB Netz AG Guideline 301 “Signal Book” using the index box principle, which you need as an operations employee in locomotives, in shunting or train escort service or in other activities in railway operations. Then check your knowledge in the quiz. Here you can test all signals randomly or sort them according to application areas. This means that the signals are grouped together in the same way as they occur in practical operational situations. This means you learn the signals in context and not stubbornly by heart!