How are the grades of bullet trains divided?

Motor trains are divided into first-class soft seats and second-class soft seats.

The seating arrangement of the first class is:

There are 4 people in each row, with 2+2 seats, an aisle in the middle, wide seats, large row spacing, pillows and pedals;

The seating arrangement of the second-class cabin is:

There are 5 people in each row, with 2+3 seats and an aisle in the middle. The seats are narrow and the row spacing is small.