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美国环保局林利福尼亚州大气资源局、伯灵顿北方·圣菲铁路（BNSF）和联合太平洋铁路（UP）最近签署了一项“原则声明”。根据该声明，两家铁路公司同意以快于正常的步伐降低机车NOX排放量。BNSF铁路和UP铁路将从2005年开始在加利福尼亚州采用“更洁净的”机车，并在此后的5年
EPA recently signed a Statement of Principles with the Department of Atmospheric Resources of Lincoln, the Burlington Northern Santa Fe Railway and the United Pacific Railway. According to the statement, the two railway companies agreed to reduce locomotive NOX emissions faster than normal. The BNSF railroad and the UP rail will have “cleaner” locomotives in California starting in 2005 and will be operating in the next five years