Related Clues:

• B.&O. et al.
• Southern Pacific and others: Abbr.
• Penn Sta. traffic
• Four Monopoly properties: Abbr.
• Blvd. crossers
• B.&O. and Reading, e.g.: Abbr.
• Some Monopoly purchases: Abbr.
• 17 Monopoly props.
• Union Pacific et al.: Abbr.
• Monopoly foursome: Abbr.
• They have Xings
• $200 purchases: Abbr.
• They're numbered in NYC
• His, in old Rome
• Monopoly quartet: Abbr.