Related Clues:

• Golfer Ernie
• Noisy trains
• Donne's '___ and Sonnets'
• See 64-Across
• Composer's output
• Some trains
• City transit
• Trains on high
• Urban transports
• Chicago trains
• Loop runners
• Overhead lines
• See 51-Across
• Race tracks
• 1997 U.S. Open winner