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10 great green moments in planes, trains and automobiles

By: Shea Gunther on Oct. 16, 2009, 11:21 p.m.

Photo: iStock

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Train wheel lubrication

Train engineers had the bright idea when they thought of lubricating train wheels, an idea that has been refined and greenified so that today's trains are more than twice as efficient than those of just a few decades ago. Lubrication cut fuel bills by more than 10 percent.