Possible Clues:

• The Iron Horse
• The Iron Horse of baseball
• 1939 retiree who said "Today I consider myself the luckiest man on the face of the earth"
• Yankee Hall of Famer
• Baseball's 'Iron Horse'
• Ripken broke his record
• Bottomless pit
• Yankee who was the first major-leaguer to have his number retired
• Yankee whose streak of consecutive games played was broken only by Ripken
• Diamond's Lou