Some 3,000 gallons of diesel fuel spilled Thursday morning after a locomotive derailed and its fuel tank ruptured.

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Three thousand or so gallons of spilled diesel fuel provided a scare Thursday morning, but the fuel was mostly contained in a railside ditch, officials said.

The spill occurred at about 7:50 a.m. after a locomotive traveling at less than 5 mph derailed in the Interbay train yard, BNSF Railway spokesman Gus Melonas said. The derailed train’s fuel tank struck a section of rail and ruptured.

While most of the diesel was contained in a nearby ditch, some did make it into storm drains and entered the West Point Treatment Plant, said Larry Altose, a spokesman for the state Department of Ecology.

There were concerns early in the day that the fuel might reach Elliott Bay.

But plant operators, notified of the situation, separated and contained the oil, Altose said. The plant’s normal operations were not impacted.

Meanwhile, the train was re-railed by 11 a.m., Melonas said.

No one was injured in the incident, he said. Investigators did not yet know the cause of the derailment Thursday evening.

Department of Ecology officials were evaluating the effect of the spill and determining whether further cleanup in the ditch would be necessary, Altose said.

There is minimal risk to the public, he said.

Brian M. Rosenthal: 206-464-3195 or brosenthal@seattletimes.com. On Twitter @brianmrosenthal.