"I want people to speak out and speak up," said organizer Michael Markley, a Washington, Pa., native. "This is poison."
Amtrak has not announced the start date for the service but a spokeswoman said it could be as soon as next week.
The shooting occurred Friday night.
Everything you need to know to dodge the orange barrels.
At first, rubber-tire shuttles would operate through the corridor, and they might be driverless.
Gunfire erupted in the 2500 block of Penn Avenue.
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Mylan said that more than two-thirds of shareholders had backed the vote. It needed more than half in order to pursue the takeover.
Anthony J. Fiore had served in the office since April 2011 and as deputy since March 2012.