Related Clues:

• Some urban lines
• High-level transit
• Some railway systems
• iPod fill
• Right-angle shapes
• 2002 champion at 62-Across
• They may be called numbers
• Trains over the road
• Many racetracks
• Letters after kays
• Urban rail systems
• Imperfect circles
• Locket shapes
• Urban carriers
• Pro golfer Ernie