I originally read it was an FCC delay. However I now see that FCC approved it last March:
“The spectrum Amtrak wanted to use in 2011 was owned by someone else,” the official says. “It took them three more years to negotiate with private parties to acquire the needed spectrum for the Washington, D.C.-to-New York corridor. Once Amtrak finalized their application, the commission approved it within two days.”
Thanks.