The calculated distance (air line) between Tai Kok Tsui and Sheung Shui is approximately 14 miles respectively 22 kilometers.
By car or train, the actual journey to Sheung Shui is certainly longer, as only the direct route (as the crow flies) between Tai Kok Tsui and Sheung Shui has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles