Sir, for Hindi-speaking states (with no separate regional language), kindly keep the regional box blank. Earlier, we didn't have the option to leave it blank, that's why we either used to put a dot there or write the Hindi name twice. But now moderator has changed the version, so you can leave it blank and update. No need to write the Hindi name twice for stations from these states (e.g. Chhattisgarh, Rajasthan, Himachal etc).