People returning home by train from Bishwa Ijtema, an annual gathering of Muslims in Tongi, by the banks of the River Turag, in the outskirts of Dhaka, Bangladesh. It is one of the largest peaceful gatherings in the world.
Just after the final prayer in the Ijtema, everyone try to return home all together by train from the nearby Tongi Railway Station, making every train fully covered like this. All the roads around Ijtema get closed during the prayer for several hours, so the way for them to return home is either jumping on a train or walk a long way. Hence the crowd on the train.