The importance of the transport costs for micro and macro geographical analyses regarding economic accessibility, interterritorial trade patterns, or regional localization and productive specialization, is nowadays paramount. Many studies have been devoted to defining and measuring transport costs from the point of view of a static cross-section perspective. However, when it comes to characterizing their evolution time, a suitable dynamic framework has not been yet presented. In this context, the contribution of this note consists on improving the existing methodology to accurately measure the change in generalized transport costs over time within the economic theory approach to index numbers and, by doing so, provide a consistent decomposition of these changes that allows us to determine precisely the effects that both economic and infrastructure determinants have on transport costs variation.