The calculated distance (air line) between Najaf and Al Maḩmūdīyah is approximately 72 miles respectively 115 kilometers.
By car or train, the actual journey to Al Maḩmūdīyah is certainly longer, as only the direct route (as the crow flies) between Najaf and Al Maḩmūdīyah has been calculated here.
Air line (approximately)
115 kilometers
62 nautical miles