Canadian company Bombardier has been given the contract to manufacture 234 coaches or 39 trains for Metro Line 4 (Wadala to Kasarvadavali) and Metro Line 4A (Kasarvadavali to Gaimukh), Mumbai Metropolitan Region Development Authority (MMRDA) said. "The first prototype train is expected to be delivered after 84 weeks from today," MMRDA tweeted on Thursday.