The Ronkonkoma branch of the Long Island Rail Road is likely to have delays through the duration of Monday's morning commute because of a derailed freight car west of the Wyandanch station, the commuter service said.

Trains will be operating at a reduced speed between Farmingdale and Wyandanch, delaying morning travel, spokeswoman Marjorie Anders said.

Anders said a single car derailed around midnight and that it was likely delays on the Ronkonkoma line would continue through the morning.

The derailed car, part of another rail system, is leaning on a utility pole which carries system wires affecting three grade crossings, Anders said.

"We have to go really slow through those crossings, and that's what's causing the delays" she said. "They will probably prevail throughout the morning."

The LIRR said service on all other branches is good, according to its website, mta.info/lirr.

Morning traffic appeared to be moving well during the commute, according to informny.com, the state Department of Transportation website.

No traffic alerts were reported at the site for major roadways.

Commuters rolled out to mostly cloudy and cold weather conditions.

A light, fast-moving snow shower hit parts of western Suffolk County before 7 a.m., and more showers are likely, mostly before 9 a.m.

Brian Ciemnecki of the National Weather Service's Upton office said there were reports of some snow leaving a light coating, mainly on grassy areas.

"It could bring visibility down a little bit, too," he said.

As morning temperatures warm, Ciemnecki said any snow is likely to transition to mostly rain.

Morning temperatures across Nassau and Suffolk counties were in the mid 30s, with daily highs expected in the low 50s, the service said.

News 12 Long Island meteorologist Rich Hoffman said any morning precipitation would be light.

Hoffman called for partly sunny skies Monday with a stray afternoon shower and winds out of the west southwest at 5 to 15 mph.