Originally Posted by rkkwan

To go by rail the whole way, I'd take the Airport Express all the way to Hong Kong, do the long 5+ minute transfer to the Island line, and then same-level cross platform transfer at North Point to the Tseung Kwan O line. It will cost more than the "official" way of switching at Tsing Yi, because you're paying the AE fare to Hong Kong and not Tsing Yi. But this means 24 minutes to HK, then 26 minutes from Central to TKO, plus about 7-8 minute of transfer. 3 train rides and under an hour, and sitting for the most part.