This train ain't always on time, especially at the starting station. And when you're on board trying to sleep, it's tough because of three reasons: 1) Loud and annoying cranking noise. 2) Non-stop shaking until it picks up speed, which isn't often. 3) You feel like someone's shoving you whenever the train starts or stops. If this train is crowded, don't book the lower berth if you're trying to avoid the three issues I just mentioned. And if you can, book a ticket on another train altogether.