Graffiti vandals have been on a rampage — painting murals and boastful tags on the outside of two dozen subway cars since New Year’s Day.
The spray-paint menaces carried out at least nine sneak attacks in the first 11 days of the year — sometimes returning to the same spot on consecutive days, sources said.
One tagger even taunted authorities for an apparent lack of vigilance, scrawling “MTA You are slacken” on the exterior of a subway car that was parked overnight in the Bronx.
“They’re like cockroaches,” one transit source said. “If you don’t keep on top of them, they come right back.”