The calculated distance (air line) between Zheleznodorozhnyy and Staraya Kupavna is approximately 8 miles respectively 12 kilometers.
By car or train, the actual journey to Staraya Kupavna is certainly longer, as only the direct route (as the crow flies) between Zheleznodorozhnyy and Staraya Kupavna has been calculated here.
Air line (approximately)
12 kilometers
7 nautical miles