The F and M lines between Manhattan and Queens will permanently swap on Monday, a change that MTA Chair and CEO Janno Lieber said on Wednesday will benefit all straphangers who frequent the affected stations.

Lieber, speaking to reporters at the 21st St.-Queensbridge station on the F line on Wednesday, insisted that there is no downside to the major service shakeup on the F and M lines between Manhattan and the World's Borough.

Instead, he said the switch would speed up service on the Queens Boulevard line (E, F, M and R trains) and reduce crowding on trains that go through two stations currently served by the F line — 21st St.-Queensbridge and Roosevelt Island.

"There are real benefits that everybody is going to see," Lieber said. "I don't think that it's fair to say that there are peo

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