Traditionally, the EMD SD70 is known as a series of diesel-electric locomotives produced by Electro-Motive Diesel. However, the CEO of the BNSF railroad (a subsidiary of Berkshire Hathaway) announced that the company would invest in a pilot program to build six liquefied natural gas (LNG) powered locomotives in 2013. The move is motivated by the wide price difference between natural gas and the diesel fuel that the majority of US locomotives currently use.