What's the difference between a through train hard sleeper and a T-shaped hard sleeper?

The hard sleeper of the through train adopts a 25T carriage, which is in good condition, high in car body, large in space, wide in bed, half-packed, with a TV set, and ***6 shops for upper, lower and upper floors, making it convenient to get up and down.

T-shaped hard sleeper is the hard sleeper of express train. The upper berth is very narrow. I can only lie on it and can hardly sit up. There are ladders up and down. Some car hard sleepers are semi-enclosed, and there are no ladders and pedals. Anyway, getting on and off is not very convenient.