Starting this weekend, the Long Island Rail Road will add an extra Sunday westbound train from the Hamptons, giving commuters a chance to get a late brunch before they leave for home.

The extra train is needed because of the growing crowds trying to get onto Sunday trains from the East End, LIRR officials say.

It will leave from Amagansett at 2:55 p.m., and make six local stops between East Hampton and Speonk before heading to Jamaica.

"We need it. They're finally doing something they should have done a long time ago," said Marina Van of the East Hampton Chamber of Commerce. "We see huge crowds of people getting off the trains, and see huge crowds getting on."

People arrive on the South Fork over several days, and have lots of trains they can take to get there. But Sunday seems to be the day most people go back home, LIRR officials say.

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"Montauk is packed. I've never seen Montauk as crowded," East Hampton Supervisor Bill Wilkinson said. "We have a ton of visitors for day trips. They're clogging up the road and clogging up the town."

Van said people who call the chamber about transportation ask about trains because they do not want to be caught in traffic jams; because of limited train schedules, she said she often advises them to take the bus.

The new train brings the total number of Sunday westbound departures to nine, and will operate on Aug. 12, 19 and 26, as well as Sept. 3, the Monday of Labor Day weekend.

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Except for the new train and the 4:33 p.m. from Bridgehampton, every other Sunday westbound train leaves from the Montauk station. The first of those westbound trains leaves at 6:41 a.m., and the last at 8:34 p.m.