Related Clues:

• NYC's commuter org.
• 1959 hit based on the traditional folk song 'The Wreck of the Old 97'
• A-train org.
• Kingston Trio hit, 1959
• Where Charlie 'may ride forever,' in song
• Underground letters
• Devilfish
• NYC subway line
• N.Y.C. trains overseer
• Charlie's endless ride, in song
• Inits. on N.Y.C. buses
• Kingston Trio hit of 1959
• 1959 hit song about 'a man named Charlie'
• Train and bus overseer, for short
• Letters on some N.Y.C. maps