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Mumbai-Delhi August Kranti Rajdhani Express at Palghar - representative image. (Superfast1111/Wikimedia Commons
In a video shared by twitter user Vaidy Voice, a railways official can be seen explaining that many passengers used to feel discomfort while sleeping on a side-lower berth due to the uneven gap when the seats were felled.
To mitigate that the railways has introduced a cushioned side-board which can be placed on the felled berth. This not only provides a continuous and smooth surface for passengers to sleep on but it also provides more surface area than the legacy berths.
It should be noted that passengers travelling in AC Two Tier have over the years complained against same fares being charged for normal and side berths considering the latter do not provide any extra space or comfort despite the higher costs.