Related Clues:

• Ernie of 7-Down
• Yellow conveyance, often
• Greyhound
• Dallas centers?
• Trains over streets
• Cross-town conveyance
• Phila. transit
• Ballad center?
• H.O.V. lane user
• Urban trains
• Grade-schooler's transportation
• Train alternative
• Choices for Chicago commuters
• They have cars that people drive under
• School transport