When purchasing tickets online, there will be a high-speed rail order in the ticketing process. Click on the high-speed rail booking page, select the dishes you want, and then click on the time node of the ride, and you can eat the box lunch when you ride.
In addition to ordering food directly online, high-speed rail bento can also be purchased from the conductor when he comes over. Train attendants are generally service personnel, so long as they are given appropriate requirements, they can be satisfied. Booking a box lunch on the high-speed rail is also a service provided by the train.