Call it fowl play.

A loose chicken took a “free range” ride, scoring a gratis subway trip to Coney Island on the N train Thursday morning after it was discovered fouling a subway car in storage.

An MTA train operator called rail control shortly after 5:20 a.m. to report that he’d found a live chicken aboard his train, which was parked on a layup track south of Astoria Blvd. The poultry passenger had “soiled the interior of the car,” sources told the Daily News.

The train, which was due to depart from the Astoria-Ditmars station on a southbound run at 6 a.m., reached that station from the layup track around 5:50 a.m.

The train car was deemed too dirty to go into service, an MTA supervisor reported a short time later — adding that the chicken was “refusing to leave the train.”

The M

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