Related Clues:
- MetroCard letters
- Subway line inserted into the theme answers
- NYC subway initials
- Org. for commuters in many big cities
- Inits. at Grand Central Terminal
- Original NYC subway line
- New York rail and bus inits
- N.Y.C. org. that operates 24/7
- NYC commuting option
- NYC commuter letters
- Kingston Trio hit about Charlie
- Kingston Trio hit with the line "He may ride forever 'neath the streets of Boston"
- Its first line went from City Hall to 145th St
- Letters on the A train
- It might help you get to Carnegie Hall, for short