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At a board meeting yesterday, the city Health Department discussed ways to help get rid of underground rats.

Based on a study of 58 subway tracks, a rodent expert testified that about half the lines in lower Manhattan have infestations.

Experts also said rodents do not live deep in the tunnels as originally thought because the electrified tracks are too dangerous.

Rats are more likely to live in the walls of the trash rooms, which are often located right on the train platforms. As many as 150 rats can live in the walls of a single trash room.

Researchers said the creatures are a safety issue because they could scare riders, causing people to jump off platforms and onto the tracks.

Recommendations included using better poison bait technology and effectively sealing off trash rooms.