Possible Clues:

• Place to buy tickets: Abbr.
• El stop: Abbr.
• BART stop
• Term.
• Victoria in London, e.g.: Abbr.
• Union in D.C., e.g.
• D.C.'s Union ___
• RR bldg.
• Training site?: Abbr.
• Penn, e.g., in N.Y.C.