Relief is coming to the LIRR — not more on-time trains, but a new opening to Penn Station.

In another election-year announcement, Gov. Andrew Cuomo said Thursday that the new entrance would be built at the southwest corner of 33rd Street and Seventh Avenue and that 33rd Street between Seventh and Eighth avenues would become a permanent pedestrian plaza.

Overcrowding has plagued Penn Station entrances, which now carry triple the pedestrian traffic they did in the late 1960s, when the current entrances were built.

“They were designed for a much smaller population,” said Cuomo. “We have doubled, sometimes tripled the population going through these facilities, and it just can’t manage it. It’s a commuter’s nightmare, and it’s also a safety concern.”

The plan also calls for new entrances to Amtrak and NJ Transit trains.

The MTA and Empire State Development Corp. are also working on rebuilding the Long Island Rail Road concourse.

When it’s done, the hall will expand from 30 feet to 57 feet wide and the ceiling will be increased from about 10 to 18 feet, officials said.

The entrance and the plaza are expected to open in 2022, a year after the new Moynihan Train Hall is supposed to be up and running.