Packed in the morning, early evening and late at night — pick a train that starts at your station
On weekdays it is extremely crowded from about 7:30 to 8:30 am and for the hour either side, from about 4:30 to 7:30 pm, and after 10:30 pm. Avoid those times if you can. If you have to ride then, choose a train that starts its run at your station — for example one starting at Oshiage — and you may get a seat. With large luggage, in a group, or with children, be ready to be pressed against other passengers as you board.