This thesis discusses the economic developments around 21 road and rail corridor projects in Africa. These projects were funded by development banks or by foreign investors and were built between 2003 and 2013. The research employs a difference-in-differences modeling approach to compare local regions around the corridor areas, as well as those further away that are not directly targeted by the corridor investments. The projects are analyzed for more than 10 years after the start of construction. Projects that are built in regions with an existing economic baseline are associated with the most growth. New built projects that are in landlocked countries are associated with less growth.