WOODLAND (CBS13) — Woodland firefighters are investigating a suspicious fire that broke out in a boxcar Wednesday evening.

Firefighters were dispatched to a train car on fire at 6:15 p.m. in the area of East Main and Thomas Streets. The boxcar contained unknown contents that were on fire, and firefighters said the flames were nearing a tank car that was clearly marked as containing diesel fuel.

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The firefighters worked to suppress the fire while protecting the tank car. Once they entered the boxcar, they found that the contents were not hazardous.

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According to a Yolo Short Line Railroad representative, the boxcar was used as storage for the railroad company and the tank car was less than a quarter full of diesel fuel.

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Woodland Battalion Chief Eric Zane said the fire was deemed suspicious in nature. Fire investigators are working with the Woodland Police Department to determine the cause.