 The INC pledged to connect all of India's million-plus cities by high-speed rail, whereas the BJP, which won the election, promised to build the Diamond Quadrilateral project, which would connect the cities of Chennai, Delhi, Kolkata, and Mumbai via high-speed rail.This project was approved as a priority for the new government in the incoming president's speech.Construction of one kilometer of high speed railway track will cost - which is 10-14 times higher than the cost of construction of standard railway.