Green Technology

Amtrak is experimenting with a bio-diesel fueled train ... called the Heartland Flyer.  

" ...  nation’s first-ever test of a cleaner and renewable biodiesel fuel blend to power a daily interstate passenger train between Oklahoma City and Fort Worth ... research project ... on the daily Heartland Flyer train operated by Amtrak ... biodiesel blend includes beef byproduct and is provided by a Texas-based vendor."

" ... the biodiesel blend known as B20 (20% pure biofuel and 80% diesel) reduced hydrocarbons and carbon monoxide each by 10 percent, reduced particulates by 15 percent and sulfates by 20 percent. ... measurements will be taken ... at the end of 12 months so any impact of the biodiesel on valves and gaskets can be measured...."

Via:  Amtrak LINK