No, the No.48 seat of the K283 train 14 from Shanghai to Chengdu is not by the window, but by the aisle outside the two-seat row of 10 near the middle of the car, and the No.49 seat next to it is by the window.

The car 14 of this K283 train is a hard-seat car, and there is no conductor room. The number of seats is 1 18, and the window seats are: seats with tail numbers of 0, 4, 5 and 9, seats 00 1, seats 1 18. See attached drawings: