Diamond Quadrilateral

The Diamond Quadrilateral is a project of the Indian railways to establish a high speed rail network in India. The Diamond Quadrilateral will connect the four mega cities in India, Delhi, Mumbai, Kolkata and Chennai, similar to the Golden Quadrilateral expressway system. High-speed train on Mumbai-Ahmedabad section will be the first high-speed train corridor to be implemented in the country.

• At present, six corridors on Diamond Quadrilateral connecting metropolitan cities have been identified for feasibility studies for high speed rail connectivity viz: (i) Delhi-Mumbai, (ii) Mumbai-Chennai, (iii) Chennai-Kolkata, (iv) Kolkata-Delhi and both diagonals i.e. (v) Delhi-Chennai and (vi) Mumbai-Kolkata routes.