The MTA is reminding NYC commuters that two major train lines between Manhattan and Queens will permanently switch places this month.

Starting Dec. 8, subway riders will have to learn new stops on the F and M lines, at least on weekdays. F and M train service between Manhattan and Queens will be switched to eliminate a merge at Queens Plaza that the agency said has caused delays for riders on the Queens Boulevard line.

The MTA first announced the subway shakeup on Sept. 29.

“We’re making this change to provide more reliable service for 1.2 million riders who take the E, F, M and R trains every day,” the MTA said in a service alert.

What is changing on the F and M?

F and M trains will permanently swap routes between Manhattan and Queens on weekdays only, from around 6 a.m. to 9:30 p.m.

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