A crooked Bronx transit cop was on a drug kingpin’s payroll over a span of 15 years — raking in tens of thousands in bribes to move cocaine by the kilo, a bombshell new federal indictment claims.

Andrew Nguyen, 41, also scanned NYPD records for information on the narcotics honcho’s competitors, removed drugs from the dealer’s stash house and orchestrated a phony traffic stop and drug “seizure” to help the dealer dodge a $245,000 debt to one of his suppliers, court papers say.

The corrupt officer teamed up with the “leader of a drug trafficking enterprise” shortly after being hired to patrol subways in Transit District 12 in the East Bronx in 2008, the feds allege. He’d struck up a friendship with the dealer, who sold heroin, cocaine and marijuana, two years earlier.

In October 2008, the

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