The NYPD’s highest-ranking chiefs are now riding the rails as part of Mayor Eric Adams crackdown on subway crime, The New York Post reports.

Under the new policy, initiated by Adams, dozens of uniformed police chiefs will be split into pairs to venture into the underground — two per eight-hour shift, police sources said.

“Mayor wants the subways to feel safe,” said one high-ranking officer. “Chiefs on the subway will spur significant presence, at the very least, at the outset. The flip side is these effects are always temporary.”

More than 100 chiefs — including one-, two-, three- and four-star chiefs — will be required to sign in and out with the NYPD Transit Bureau before and after their scheduled subway shifts, according to an email sent to NYPD brass Monday and obtained by The Post.