Related Clues:

• Level ends?
• See 52-Across
• The six of ''Little Nellie Kelly''
• Hollow center?
• Cousins of monorails
• Straphanger's ride
• Tiger's rival Ernie
• Trains overhead
• Merry Pranksters' vehicle
• Public vehicle
• School ___
• 2002 British Open champion
• Ernie of the PGA
• Railways with a view
• Subway relatives