A transit worker was arrested Thursday night in the Bronx after police discovered that he had stolen enough scraps and materials from a rail yard to build a trailer,  the New York Daily News reports.

Track worker William Grimaldi admitted to investigators that he took enough parts and material from the Westchester Yard to fashion a flat-bed trailer, authorities said.

“I’ve been doing this for a few years,” Grimadi told Investigator John Flannery of the MTA inspector general’s office, according to the criminal complaint filed after his Wednesday night arrest.

“I thought the stuff was garbage,” Grimaldi told authorities. He also acknowledged knowing NYC Transit paid a contractor to take excess material and sell it for the going rate, the complaint states.