Hello how may I help you? I need some help with a train schedule please? Okay which city and which line are you needing help with? I'm in Boston, and I'm waiting on the Green Line on Commonwealth Ave Okey the Green Line runs every 20 minutes from Commonwealth Avenue to the downtown college district Okay, So another train should be by soon. Hopefully I won't be too late The next train should arrive in 5 minutes at 6:20 am Thank you so much for your help! You're welcome. The train is on time. Thank you again. Now I can relax! Have a great trip!