 The current fastest train on the Chennai-Bengaluru route, the Shatabdi Express, completes the journey in 7 hours.The Diamond Quadrilateral high speed network connecting the four major cities of Chennai, Delhi, Kolkata, and Mumbai was a key plank in the BJP's election manifesto.PM Modi mentioned in his address to the joint session of Parliament on 9 June 2014 that the new Government was committing to launch the project.