There is enough beef waste in the US to fuel trains. Via The Guardian:
US rail operator Amtrak may have given the term “cattle car” a whole new meaning with the first test of a biodiesel train that runs on beef byproducts.
Operating on a $274,000 (£178,000) grant from the Federal Railroad Administration, the state-owned rail company has begun operating its daily Heartland Flyer train, travelling between Oklahoma City and Forth Worth, using B20 biodiesel fuel.
The fuel, which mixes 80 per cent diesel with 20 per cent biofuel, cuts both hydrocarbon and carbon monoxide emissions by 10 per cent, according to the company, which said that the fuel also reduces particulates by 15 per cent and sulphates by 20 per cent compared to standard diesel fuels.
According to DirectFuels, makers of meat biodiesel, they’re “using blends of animal fats, but will be able to handle a range of feedstocks”.