The calculated distance (air line) between Tsim Sha Tsui and Sheung Shui is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Sheung Shui is certainly longer, as only the direct route (as the crow flies) between Tsim Sha Tsui and Sheung Shui has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles