In a wheat field near the mighty Ganges river stands a cracked foundation stone surrounded by nibbling goats and farmers driving their cattle in the baking sun. Unveiled more than four years ago, it’s all that remains of an ambition to build India’s longest expressway, an eight-lane, 1,050-km (650-mile) road that would have run through Uttar Pradesh and connected one of the country’s most backward regions to the doorstep of the nation’s capital.