SACRAMENTO, Calif. -- A fire on a train trestle sent huge plumes of smoke over Sacramento late Thursday afternoon. The fire burned near the American River Parkway and Highway 80, near the California Exposition and State Fair. Smoke could be seen for miles. The fire is about 100 yards long, according to the Sacramento Fire Department. A fire officials said there appears to be no structures on the tracks. Four or five engines responded to the blaze, according to fire officials. The cause is unknown. Stay with NBC11 and NBC11.com for more information