Grünau was not only the starting point of the Henschelbahn: excerpt from the railway timetable valid from October 1950 - From Berlin-Grünau railroad station, the trains use the connecting curve to the Güteraußenring (GAR, Berlin Outer Freight Ring, later S-Bahn to Schönefeld), The connecting curve no longer exists today. Next stations are Altglienicke, Grünbergallee and Schönefeld. From here, the southern part of the Neukölln-Mittenwalder Eisenbahn (NME) is used to reach Mittenwalde via Selchow, Groß Kienitz and Brusendorf. From Mittenwalde it goes via Gallun and Motzen to the end point Töpchin.
Source: CIA / Deutsche Reichsbahn