Can I help you ?   Is this the right subway to the Wall Street ?   Yes , it is .   Could you tell me shall I take the express or local train ?   Sure . The local train . It stops at every station .   Which of them is the local train , please ?   You take the D train on the downtown platform , and go three stops .   How much is the fare ?   One dollar and twenty cents . You give me the money and I ’ ll exchange it for a token .   What should I do with the token ? 