Possible Clues:

• 'If You See Something, Say Something' transit org
• Kingston Trio hit of 1959
• Boston transit syst.
• NYC underground system
• Beantown transit syst.
• Kingston Trio song
• LA bus gp.
• Where Charlie was trapped, in a 1959 song
• Kingston Trio hit with the lyric 'Fight the fare increase!'
• Hit song of 1959