随着势头继续建立在长途货运分部在美国，清洁能源燃料公司已经发布了。四道天然气，其不断增长的客户改用天然气作为运输燃料或扩大其现有船队的更新。此版本包括最近签署的新协议，包括清洁能源的第一条铁路，GE运输系统提供液化天然气（LNG）的新举措，测试LNG机车​​，燃料处理。

“相当大的进步最近已经取得了进一步推动美国和更快的道路上，以天然气，清洁能源公司总裁兼首席执行官J. Littlefair，”安德鲁说。“第四版路天然气中含有天然气燃料协议签署以来的第三个版本发布2013年2月25上市。重点产业的发展还指出，如UPS最近宣布，它将扩大其LNG船队增加700拖拉机，并建立4个液化天然气站，由2014年年底。“

清洁能源是燃料柴电发动机制造商GE运输系统的合作伙伴，探讨的机会，以扩大其范围，包括液化天然气为动力的机车。GE运输系统进行了测试，使用液化天然气（LNG）5月24日在宾夕法尼亚州伊利，一辆经过改装的双燃料机车。清洁能源提供了燃 ​​料从皮肯斯LNG植物，加油设备加油咨询和运营。

天然气燃料成本高达1.50美元每加仑比汽油或柴油，当地市场情况而定。天然气燃料的使用，不仅降低了车辆的运营成本，而且也减少了温室气体排放的轻型车辆的30％和23％中型到重型车辆。

As momentum continues to build in the long-haul trucking segment in the USA, Clean Energy Fuels Corp. has released Vol. IV of ROAD TO NATURAL GAS, an update of its growing portfolio of customers making the switch to natural gas as a transportation fuel or expanding their current fleets. This edition includes new agreements recently signed including Clean Energy’s first railroad fuel deal with GE Transportation to provide liquefied natural gas (LNG) for its new initiative to test LNG locomotives.

“Considerable strides have recently been made to propel America further and faster down the road to natural gas,” said Andrew J. Littlefair, Clean Energy’s president and CEO.  “The fourth edition of ROAD TO NATURAL GAS contains a listing of natural gas fuel agreements signed since the third edition was released on February 25, 2013. Key industry developments are also noted, such as UPS’ recent announcement that it will expand its LNG fleet with 700 additional tractors and build four LNG stations by the end of 2014.”

Clean Energy is a fuel partner of GE Transportation as the manufacturer of diesel-electric engines explores the opportunity to expand its offering to include LNG-powered locomotives. GE Transportation conducted a test using LNG in a converted dual-fuel locomotive on May 24 in Erie, PA. Clean Energy provided the fuel from its Pickens LNG Plant, fueling equipment and operational fueling consulting.

Natural gas fuel costs up to $1.50 less per gallon than gasoline or diesel, depending on local market conditions. The use of natural gas fuel not only reduces operating costs for vehicles, but also reduces greenhouse gas emissions up to 30% in light-duty vehicles and 23% in medium to heavy-duty vehicles.