The Central Railway (CR) on Thursday launched the 'GO Mumbai' smartcard, a first-of-its-kind travel card which works like a pre-paid telephone card, and can be used for travel on the main line of CR, its Harbour line and BEST buses. "This is a red-letter day. A journey begins with buying a ticket and serpentine queues can be extremely cumbersome for passengers. The 'GO Mumbai' smartcard is one of the steps we have taken to permanently terminate these long queues," said general manager of CR, Sowmya Raghavan, who unveiled the card.