Washington, Jan 30 (Reporter) Washington metrorail experienced delays near the Reagan National Airport where a military helicopter collided with a regional plane, the local authorities said on Thursday. "Expect delays in both directions because of a signal problem at National Airport," a statement said. The incident affected Blue and Yellow lines, it added. US Federal Aviation Administration (FAA) said earlier that a PSA Airlines jet collided with a Sikorsky H-60 helicopter while on approach to the Reagan National Airport near Washington, DC...////...