A broken rail just east of the Mineola LIRR station affected 60,000 morning commuters Wednesday with dozens of delayed and cancelled trains, officials said.

Compounding the rush-hour chaos that began with the broken rail about 5:55 a.m. was a 9 a.m. strike of an oversize truck into the Long Island Rail Road bridge at Nassau Boulevard and Merillon Avenue, suspending rail traffic there for a half-hour, a spokesman said.

Some 65 trains in both directions were delayed an average of 32 minutes on the Main Line after a rail broke east of the Mineola station about 5:55 a.m. There is only one track there in each direction, the railroad said.

“The repairs were completed at 11:15 and, at about 12:15 p.m., train service had been restored,” LIRR spokesman Aaron Donovan said.

Donovan said the service disruptions were the latest testament to the importance of building a third track on the Main Line, Donovan said.

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The LIRR and Gov. Andrew M. Cuomo have proposed such a project, which would add a 9.8-mile track between Floral Park and Hicksville within the LIRR’s existing property.

“I can’t stress enough how this morning’s commute would be eased if we had a third track in place,” Donovan said.

Donovan likened Wednesday’s broken rail and subsequent delays to a traffic jam that’s caused by a car breaking down on one lane of a two-lane highway.

“That’s the position that we’re in now,” he said during the delay. “We only have one lane to get around it. If you had two lanes to get around it, it’s a lot easier. Losing one third of your capacity instead of half your capacity is a huge difference.”

Adding to Wednesday’s delays in Mineola was the inspection of the LIRR bridge after the truck strike.

About 9 a.m., the truck struck the bridge, and trains were ordered to travel at a slower speed as a precaution, Donovan said. Eastbound service on the Port Jefferson, Ronkonkoma and Oyster Bay branches had been suspended for about a half-hour beginning about 10 a.m. Later Wednesday, trains were able to resume normal speeds.

The LIRR said it had canceled about 10 trains Wednesday.

Project officials have said construction could begin on a third track `as early as 2017 and last three to four years. Officials have estimated the cost at between $1 billion and $1.5 billion.

With Gary Dymski and Alfonso A. Castillo