If it's a second class car, there are two types of cars, 74-person capacity and 85-person capacity. The 85-person car, ***17 rows, 5 seats per row, 51 should be by the window, the 74-person car, ***15 rows, in addition to the first row are 5 seats, due to the first row for 4 seats, so 51 should be by the aisle. Specifically, see my second-class carriage seating schematic drawn according to the 74-person model map of the moving train group.