Not 51 jabird, it's 54.
When I realised I got that wrong, I thought shall I correct it or wait for a fellow pedant to beat me to it.
Official platform count is 26, including the lower levels, and suggesting the new tunnel will take #s 31-34.
At least it does start at 1 - and after all, hotels usually number 1xx, 2xx according to the floor, not a direct sequence, so it isn't entirely illogical.