ABOARD THE HEARTLAND FLYER (AP) -- Amtrak and transportation officials from Oklahoma and Texas have started a yearlong test to see whether beef-based biodiesel can efficiently run The Heartland Flyer passenger train between Oklahoma City and Fort Worth.
Tallow from Texas cattle -- fat often used in soap or animal feed -- is supplying 20 percent of the fuel for the 3,200-horsepower engine, the rest is regular No. 2 diesel.
After a year, Amtrak will inspect the engine and collect exhaust data. Other tests will be performed throughout the year.
The train stops at Oklahoma City, Norman, Purcell, Pauls Valley and Ardmore in Oklahoma and at Gainesville and Fort Worth in Texas.