America's energy revolution is causing an evolution in its locomotive manufacturing industry.
A glut of natural gas has opened the door for a race between general electric and caterpillar to develop natural gas-powered models in a potential shift from diesel as the fuel for railroads.
Liquefied natural gas holds the promise of cutting railroads' costs, curbing greenhouse-gas emissions and ushering in the industry's biggest change in fuel technology since diesel displaced steam in the 1950s.
GE Transportation Chief Executive Lorenzo Simonelli has been quoted as saying
"We are entering a new era where natural gas will be a major fuel,and if you believe the price advantage over diesel is going to stay here for the next 10 to 15 years, then liquefied natural gas is a revolutionary fuel."