The book "Transport Infrastructure in Time, Scope and Scale" offers a comprehensive analysis of the economic aspects of transport infrastructures and their development from 1850 to the present. It highlights the continuous evolution of these systems, which have increased in complexity and reach over time. Transport infrastructures are not only crucial drivers of economic development but also act as independent economic players. The various functions that these infrastructures have assumed over time are discussed, along with the associated economic theories and practices. Through an institutional perspective, the long-term development of ownership and financing of transport systems, as well as their connection to different political areas, is examined. A longitudinal case study approach to transport infrastructure policy in Sweden serves as an example of the driving factors that bring about changes and transformations in the systems across time, scope, and scale.