A BNSF train derailed on Thursday near Padilla Bay in Anacortes, Washington, spilling at least 2,500 gallons of diesel fuel.
The spill occurred on the Swinomish Reservation and the Environmental Protection Agency (EPA) has confirmed that the fuel has seeped into the soil but has not spilled into the nearby bay.
Crews used cranes to lift and ride the cars as a precautionary measure in case the oil reached the water.
The rail company has assumed responsibility for the derailment, but the cause is still unknown.
So far, there have been no impacts on fish or wildlife, and efforts to excavate the affected area are underway to prevent any weather-driven events from causing further damage.