A signal problem was delaying the LIRR's Ronkonkoma branch up to 15 minutes Wednesday morning.

The railroad said that a defective signal in Central Islip was to blame, but said emergency repairs would not be made until after the morning rush hour.

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Visiting Christmasland in Deer Park ... LI Works: Model trains ... Get the latest news and more great videos at NewsdayTV

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Visiting Christmasland in Deer Park ... LI Works: Model trains ... Get the latest news and more great videos at NewsdayTV

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