Related Clues:

• RR structures
• Train sched. list
• Boarding zones: Abbr.
• Dots on some maps: Abbr.
• Stops for 31-down
• Union Sq. and Times Sq.
• Radio choices: Abbr.
• Penn et al.: Abbr.
• Short stops?
• Series on a sched
• Planned stops: Abbr
• Metro map points: Abbr
• Amtrak stops: Abbr
• TV grid rows
• BART map markings