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若干年前发生的发动机燃料短缺促使人们对代用燃料的开发作出了许多努力。伯灵顿北方铁路所作的一种探索性的努力就是使机车柴油机作为双燃料（柴油—气体燃料）燃用压缩天然气（CNG）[1]。考虑到机车使用压缩天然气会受到贮存容积大和其它的限制，所以着手了一项使机车燃用液化天然气燃料的计划。由于天然气的成分会因其来源和其制备工艺而异，所以将其成分控制到基本纯净的液态甲烷以用作发动机燃料亦是所希望的。本文描述了为提供车载式燃料供送系统和将柴油机改装成以双燃料料方式烧气体燃料所作的努力。最初的试验结果表明，当燃用气体燃料时，机车系统达到了燃用柴油时的全功率，并且具有相同的燃料效率（制动燃料消耗率）。已着手进行扩大试验，其中包括美国铁路协会500h耐久性试验，以进一步获取有关发动机寿命、磨耗率、机油寿命等方面的数据。气体和颗粒排放量的监测将会导致对发动机的进一步修改以使排放量达到最低限度。然而，初步的试验显示了全负荷运转时根本没有烟。
A few years ago, the shortage of engine fuel prompted many people to devote themselves to the development of alternative fuels. An exploratory effort by the Burlington North Railway has been to make diesel locomotives burn natural gas (CNG) as bi-fuel (diesel-gas fuel) [1]. Considering that the use of compressed natural gas by locomotives is subject to large storage volumes and other restrictions, a plan has been taken to make locomotives liquefied with liquefied natural gas. Since the composition of natural gas will vary depending on its source and its manufacturing process, it is also desirable to control its composition to essentially pure liquid methane for use as an engine fuel. This article describes efforts to provide a vehicle-mounted fuel delivery system and retrofitting a diesel engine to burn a biodiesel fuel in a dual-fuel mode. Initial test results show that the locomotive system achieves full power when diesel fuel is used and has the same fuel efficiency (brake fuel consumption rate) when using gaseous fuel. An expanded trial has been initiated, including the American Railroad Association’s 500h Durability Test to further capture data on engine life, wear rates, oil life, and more. Monitoring of gas and particulate emissions will result in further modifications to the engine to minimize emissions. However, preliminary tests showed that there was no smoke at all during full load operation.