1860s - Sharon is researching how Thomas Jackson (Mr HSBC) first traveled to Hong Kong in the 1860s. Here's the story so far: http://sharonoddiebrown.blogspot.co.uk/2014/02/thomas-jackson-and-overland-route.html
1870s - There are several notes about it in the thread about the 1878 fire: http://gwulo.com/The-Great-Fire-of-Hong-Kong
1920s - See this thread: http://gwulo.com/node/17157
If you know of any other good descriptions, please let us know in the comments below.
Regards, David