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Some have more than 200 cars and carry hazardous materials such as propane gas, sodium chlorate and sulfuric acid, said Bellefleur, who is among those pushing for the construction of the bypass.

While those might sound like ingredients for your bathroom cleaner, barium peroxide is found in fireworks and sodium chlorate is a weed killer.

State Department of Ecology and Adams County Emergency Management officials were not informed by Union Pacific of the sodium chlorate spill until March 16 — two days after the derailment.

The spill of sodium chlorate, a crystalline chemical used in bleaching paper pulp, happened in one train car that derailed outside the tunnel.

Union Pacific did not at first realize the sodium chlorate had spilled, and in an initial report said no hazardous cargo had been released, according to McMahan.