coal fired locomotive

例句：

1. 1. The coal-fired locomotive is a common mode of transportation in many regions.
   煤火机车是许多地区常见的交通工具。
2. 2.The coal-fired locomotive has been the backbone of our country's railway system for decades.
   煤火机车几十年来一直是我国铁路系统的核心。
3. 3. The coal-fired locomotive was designed to be more energy-efficient than its diesel counterparts.
   煤火机车设计上比柴油机车更节能。