MUMBAI, April 22 -- The much-awaited Metro 3, also known as the Aqua line, has entered a crucial stage. Starting this week, the authorities will begin loaded integrated trials on the trains in the Phase 1 Aarey-Bandra Kurla Complex (BKC) route. So far, dry runs with empty coaches were being carried out to test the metro's designed speeds of up to 95 kmph....