A derailed train plunged into a ravine in Congo Republic, killing around 50 passengers on a deadly rail link in the oil-producing Central African state, a national rail company source said on Tuesday.
The accident happened late on Monday night after the train left the coastal town of Pointe-Noire on the Chemin de Fer Congo Ocean line to the capital Brazzaville, a line which has seen at least two serious accidents in recent years.
"Unfortunately the train took a corner that turned out to be fatal," said the rail company source, who declined to be identified because he was unauthorized to speak publicly.
Four of the wagons careered into the ravine.
The source said the accident happened near the station of Yanga, around 60 kilometres from Pointe-Noire.
At least 50 people were killed on the same line in 2001, many of them burned to death, when two trains collided at Mvougounti around 75 kilometres east of Pointe-Noire.
Eight years earlier, about 100 people died when a passenger train slammed into a freight train, also at Mvougounti.
The lack of roads and the dysfunctional railway system between the main towns make travel difficult and contribute to the high cost of food and imported goods in the capital and throughout neighbouring land-locked nations.
Chinese engineers started work late last year on a $500-million road linking the oil hub of Pointe-Noire with Brazzaville, a project that will involve crossing equatorial forests and steep mountains.
Congo, which has long exported millions of barrels of oil but remains mostly poor and suffers from poor infrastructure, is seeking to diversify its economy as oil reserves wind down.