Book excerpt: This book discusses policy instruments for sustainable infrastructure developments. Railways are one of the most important developmental instruments of a region, province, or country. They play a crucial role in economic development, urban growth, urban mobility, regional susceptibility, market integration, and world trade. Railways are an integral part of regional and urban development, both in terms of freight and passenger transport. By offering case studies from various regions and cities in South Asia, this book examines the evolution of railway transportation and the impact of these infrastructure projects on regional and urban development. It examines the interactions between evolving infrastructures and competing demands and considers the negative and positive externalities of railway transportation for people, places, and locations. The contributions analyze issues such as network infrastructure planning and technological development, passenger mobility and satisfaction, vulnerability to environmental impacts, and cross-border trade.