Was situated at today's Tsuen Kam Centre (Block 1) at Sai Lau Kok Road. Can be seen on the 1928 map at hkmaps.hk, still on the 1952 map on Gwulo. The station was replaced in 1959 by a new one (see comment below). <Read more ...>
I'm not 100% sure it was called Castle Peak Police Station. It may have been named after one of the nearby villages such as San Hui.
The dates are an estimate, based on the years that this police station appears on the maps at http://www.hkmaps.hk/mapviewer.html. As of 23 May 2019, the earliest map that shows it is "Map 1928" (not shown on "Map 1922"), and the latest map that shows it is "Map 1957" (not shown on "Map 1960"). <Read more ...>