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使用天然气作为代用燃料有益于降低排放和全球环境，同时能为象伊朗这样的国家解决隧道内的机车运行、实现能源的多样化和节省能源的问题。在柴油机上使用天然气有两种方式，一种是改柴油燃烧为奥托循环，即专用天然气发动机，另一种是使用80％的天然气和20％的柴油混合物的柴油双燃料发动机。由于排放物及其环境因素，采用引燃喷射的双燃料发动机不适用于市内用重型车辆，但在城市间车辆，特别是机车上却可应用。在本文中，考察了天然气作为最合适使用引燃喷射方式的代用燃料的优点，并讨论了在伊朗及其它国家使用该方法所获得的试验结果。在本文中，提出了柴油机使用天然气存在的困难和如何着手解决，同时还介绍了伊朗改造机车发动机的方法和为燃料罐补充燃料的天然气车燃料站的修建。改造机车发动机所采用合适的方法借鉴了作者改造德黑兰城市公共汽车使用气体燃料的经验。
The use of natural gas as a substitute fuel is good for reducing emissions and the global environment. It can also solve the locomotive operation in tunnels, diversify energy sources and save energy for countries like Iran. There are two ways to use natural gas on a diesel engine. One is to turn diesel into Otto cycle, a dedicated natural gas engine, and the other is a diesel dual-fuel engine using 80% natural gas and 20% diesel. Due to emissions and their environmental factors, dual-fuel engines using pilot injection are not suitable for heavy vehicles in the city, but can be used in intercity vehicles, especially in locomotives. In this paper, the advantages of natural gas as the most suitable alternative fuel for pilot injection are examined and the results obtained using this method in Iran and elsewhere are discussed. In this paper, the difficulties of how to use natural gas for diesel engines and how to deal with them are put forward. The methods of Iran’s engine modification of locomotives and the construction of natural gas fuel stations for refueling fuel tanks are also introduced. The right approach to retrofitting a locomotive engine draws on the author’s experience with retrofitting teflon-fueled urban buses.