BENGALURU: The Bangalore Metro Rail Corporation Limited (BMRCL) on Wednesday fixed the minimum balance to be maintained in contactless smartcards, which commuters carry for Metro travels, at Rs 50. This means Metro station gates won’t open if the balance on your card is less than Rs 50.In a media circular, BMRCL chief public relations officer BL Yeshavanth Chavan said: “In order to save Metro commuters the inconvenience of having to top up their smartcards at destination stations, the minimum balance on a card henceforth has to be Rs 50 at the originating station. This has come into effect from the evening of March 27, 2019.”.