New York’s Metropolitan Transportation Authority, in the aftermath of the Metro-North Railroad derailment that killed four commuters, said it intends to fully implement so-called positive train control technology that could have prevented Sunday’s deadly crash.

But the MTA, while saying in a statement late Tuesday that it “will make sure the appropriate funding is made to implement PTC on the most aggressive schedule possible,” said doing so by the 2015 deadline will be extremely difficult.

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