The number of seats with the prefix 1 and k is 1 18, the numbers ending in 4, 9 or 1 5 are window seats, 4 and 9 are two window seats, and 1 and 5 are three window seats.

2. If the number of seats with K prefix is 1 12, then the number of seats ending with 8, 3 or 0, 5 is by the window, 8, 3 are two by the window, and 0, 5 are three by the window.

3. The mantissa of window seat number of T-prefix train is generally 0, 4, 5 and 9.

4.D-prefix trains have 3+2 seats, 2+2 seats and 2+ 1 seat. The window seats are a and f.

4. For G-prefix trains, 3+2 is the second-class seat of high-speed rail, 2+2 is the first-class seat, 2+ 1 is the special seat, and 1 is the business seat. In all the different cabins, A and F are by the window.