Urban rail transit in Africa has emerged as a growing form of transit due to rapid urbanization that has occurred in recent decades across the continent. Some of these transit systems are older and more developed, such as the metro in Cairo which opened in 1987. Others such as the light-rail system in Addis Ababa are much more recent, which opened 2015. A variety of technologies are being used ranging from light-rail, bus rapid-transit, and commuter-rail etc. Africa for several decades saw minimal investment in rail infrastructure, but in recent years due to urban population growth and improved financing options, investment in rail networks has increased.