Mumbai, July 5 -- Three companies, including a Chinese firm, have shown interest in manufacturing 234 coaches for Mumbai Metro-4 (Wadala-Thane-Kasarvadawali) as well as its extension line 4A (till Gaimukh). The development comes amid the border stand-off between India and China in Ladakh and the consequent cancellation of bids given to Chinese firms in various projects across sectors....