Prime Minister Narendra Modi on Friday flagged off the RapidX train connecting Sahibabad to Duhai depot in UP.This marks the launch of Regional Rapid Transit System (RRTS) in India.This is India’s first RapidX train which will be known as ‘NaMo Bharat’.PM Modi also interacted with school children and crew of RapidX train - 'NaMo Bharat', onboard the train.