There is not only a railway station, but also a metro and an overground train. You need to be careful in finding the right entrance/exit and platform. It took me a while to find the right platform. I had to contact the station staff. Thank you. They helped.
Difficult navigation inside . There are many entrances and exits. The platform number is reported 15 minutes before departure , so everyone is crowding at the scoreboard waiting for the number to be indicated and then they head to the train in a crush