Energy Transition in Transport Systems examines transportation sector transformation from fossil fuels to sustainable energy sources. Through global case studies exploring electrified road transport, sustainable aviation, rail systems, and maritime shipping, the text demonstrates diverse transition pathways. The material analyzes technological, economic, policy, and behavioral dimensions enabling transport decarbonization. Each chapter examines specific transport modes and energy technologies including battery electric vehicles, hydrogen fuel cells, sustainable aviation fuels, and renewable electricity. Topics encompass vehicle technology development, charging infrastructure, policy instruments, business models, and consumer adoption. Importantly, the text addresses social dimensions including equity, accessibility, employment transitions, and ensuring just transition benefits all communities. The book explores challenges including infrastructure requirements, technology costs, grid integration, and international coordination needs. This resource serves transportation planners, energy policy analysts, automotive industry professionals, and urban mobility specialists. Through comprehensive sectoral analysis combining technical assessments with policy insights, the text develops understanding essential for accelerating transport electrification, advancing alternative fuels, and achieving sustainable mobility transitions globally while addressing social equity.