Wir fahren mit der Bahn（1976）

Two boys aged 9 and 10, Jan and Christoph, want to visit their grandma, who lives in another town. They travel by train, on their own. They buy their tickets, find the right platform and get on the right train. And they know how to behave on the train. So, as expected, the train trip to Grandma's is a safe affair and great fun for the boys.