The chicken-or-egg conundrum that once plagued the natural gas transportation industry is slowly fading as a wide infrastructure is built and more vehicles hit the roads. 

Clean Energy Fuels, Chesapeake Energy, and General Electric are leading the infrastructure charge, building a nationwide natural gas infrastructure. In 2013, Westport Innovations and Cummins are teaming up to deliver the next-generation of natural gas engines, another key step for the industry.

If natural gas is a big player in the future of transportation, then this is the year when we will start to see progress. 

Fool contributor Travis Hoium has no position in any stocks mentioned. You can follow Travis on Twitter at @FlushDrawFool, check out his personal stock holdings or follow his CAPS picks at TMFFlushDraw

The Motley Fool recommends Clean Energy Fuels, Cummins, and Westport Innovations. The Motley Fool owns shares of Cummins, General Electric Company, and Westport Innovations and has the following options: Long Jan 2014 $20 Calls on Chesapeake Energy, Long Jan 2014 $30 Calls on Chesapeake Energy, and Short Jan 2014 $15 Puts on Chesapeake Energy. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.