The calculated distance (air line) between Tuen Mun and Sha Tin Wai is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Sha Tin Wai is certainly longer, as only the direct route (as the crow flies) between Tuen Mun and Sha Tin Wai has been calculated here.
Air line (approximately)
23 kilometers
13 nautical miles