The central aim of this paper is to provide an up-to-date snapshot of hybrid and hydrogen technology-related developments and activities in the North American heavy haul railway setting, placed in the context of the transportation industry more broadly. An overview of relevant alternative propulsion technologies is provided, including a discussion of applicability to the transportation sector in general and heavy haul freight rail specifically. This is followed by a discussion of current developments and research in alternative and blended fuels, discussed again in both general and specific settings. Key factors and technical considerations for heavy haul applications are reviewed, followed by a discussion of non-technical and human factors that motivate a move toward clean energy in North American Heavy Haul systems. Finally, current project activities are described to provide a clear understanding of both the status and trajectory of hybrid and hydrogen technologies in the established context.

本文的中心目标是提供北美重载铁路环境中混合和氢技术相关发展和活动的最新快照，放在更广泛的运输行业背景下。提供了相关替代推进技术的概述，包括对一般运输部门和特别是重载货运铁路的适用性的讨论。随后讨论了替代燃料和混合燃料的当前发展和研究，并在一般和特定环境中再次进行了讨论。回顾了重载应用的关键因素和技术考虑因素，然后讨论了推动北美重载系统转向清洁能源的非技术和人为因素。最后，