When was the Congo-Ocean Railway built between Brazzaville and Pointe-Noire?

The Congo-Ocean Railway, which connects Brazzaville to the port of Pointe-Noire, was built between 1921 and 1934.123

The project was constructed to bypass the rapids of the lower Congo River and facilitate trade. It is important to acknowledge the profound human cost of this infrastructure: the construction relied on forced labor, and it is estimated that between 15,000 and 20,000 Africans died during its development.132