Transport in the Republic of the Congo includes land, air and water transportation. The country's rail system was built by forced laborers during the <answer>1930s</answer> and largely remains in operation. There are also over 1000 km of paved roads and two major international airports (Maya-Maya Airport and Pointe Noire Airport) which have flights to Paris and many African cities. The country also has a large port on the Atlantic Ocean at Pointe-Noire and others along the Congo River at Brazzaville and Impfondo.
When was the Congo's train system built?
1930s