It also destroyed a boardwalk that runs through the wetlands.
Fire forced the shutdown of Metro-North service Monday night, but trains have been running normally since then.
The first started next to the tracks and was fueled by discarded railroad ties that Metro-North workers dump along the tracks. They are soaked in creosote, which means they can burn for a long time.
Firefighters expect hot spots to smolder for days, and they will be monitoring the situation.
No injuries were reported.
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