South Africa’s largest rail operator Transnet informed its customers that the rail line connecting Gauteng province with Africa’s largest port operated for only 36 hours over the course of six days last week.

According to a Bloomberg article, the rail connecting the two suffered from theft, vandalism, and rail damage, causing its operational capacity to drop to 25%.

The letter sent by Transnet to its customers read, “For the past week, there have been a total of 39 security-related incidents targeting critical areas on the mainline resulting in the closure of the line,” reported Bloomberg.

The rail line between Durban and Gauteng passes through Johannesburg and Pretoria, two of the country’s key cities. The movement of containers and other cargo types was disrupted due to the incidents. Nearly 60 trains were either stuck on the network or in rail yards, said Transnet.

The country has been suffering from the weak infrastructure of its rail system. An overview conducted by the US International Trade Administration highlighted that despite having the best rail network in the continent, South Africa’s rail and port capacity deficits remain a severe constraint in domestic and regional trade.

Earlier in February, the rail operator announced its intention to reduce its network by 35% to focus on more profitable cargo.