The MTA says the F and M subway lines will swap to improve service starting Monday, with M trains will soon be stopping at the Queensbridge-21st Street station currently served by the F line.

Signs are now up, and even the permanent signage is being changed. Customer service ambassadors were busy handing out fliers Wednesday to alert commuters about the switch, which is being done to alleviate train congestion.

“There’s a merge at Queens Plaza, which is a chokepoint, which creates all kinds of crossing and throughput problems, which actually causes a ton of delays,” MTA Chair and CEO Janno Lieber said. “It’s going to increase reliability for 1.2 million riders who use these trains every day.”

Currently, the F goes through the 63rd Street tunnel and essentially crosses the E, M and R; th

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