The Indian Railways is upgrading the tracks on Golden Quadrilateral and Diagonals, connecting the 4 metro cities, to cater to trains running at a which speed?

• A. 110 km-140 km/hour
• B. 120 km-150 km/hour
• C. 130 km-160 km/hour
• D. 140 km-170 km/hour
• E. 150 km-180 km/hour