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伯灵顿北方铁路（BN）开展多种机车代用能源的可行性研究已有10多年。现已确认，液化高精制天然气（即冷冻液态甲烷，简称为RLM）是一种可行的柴油的替代品。BN铁路已经改装了两台GM公司制造的SD－40－2型内燃机车以用来进行烧冷冻液态甲烷燃料的运行试验。此种燃料装在一辆容量为25000加仑、可同时为两台机车提供燃料的燃料车内。首台改装的天然气机车于1992年2月投入商业运营，第二台改装的天然气机车和一辆经过改进设计的燃料车于1992年11月与首台改装的天然气机车联挂，目前正在BN铁路的北部运煤干线上进行商业运营。BN铁路进行了广泛的有关安全性方面的测量和研究，以确保以天然气为动力源的机车的概念，它的实施和运用是安全的。BN铁路不但对列车乘务员、维修人员进行了安全操作方面的培训，而且还对天然气机车运营沿线的消防和紧急救援人员进行了专门培训。BN铁路期望通过应用以天然气为动力源的机车，能够获得明显的效益，其中包括降低燃料费用，减少发动机的维修以及能够满足目前和将来的机车排放限制标准。
The Burlington Northern Railway (BN) has been conducting feasibility studies on alternative locomotive energy sources for more than a decade. It has now been confirmed that liquefied, highly refined natural gas (ie, frozen liquid methane, or RLM for short) is a viable alternative to diesel. BN Railway has already retrofitted two SD-40-2 diesel locomotives manufactured by GM to test the operation of burning liquid methane fuel. The fuel is housed in a 25,000-gallon fuel-fired car that powers both locomotives. The first modified natural gas locomotive was put into commercial operation in February 1992 and the second modified natural gas locomotive and an engineered fuel car were linked to the first modified natural gas locomotive in November 1992 and are currently on the BN Railroad North coal transport routes on the commercial operation. BN Railway carried out a wide range of safety aspects of measurement and research to ensure that the natural gas-powered locomotive concept, its implementation and application is safe. The BN railway not only trains flight attendants and maintenance personnel for safe operation, but also specializes in firefighting and emergency rescue workers along the operation of natural gas locomotives. BN Rail expects to realize significant benefits through the use of natural gas-powered locomotives, including reducing fuel costs, reducing engine maintenance, and meeting current and future locomotive emission limits.