Pray! What is the reason for the derailment of Tanzanian trains?

Local time in Tanzania, a train carrying 720 passengers derailed, causing many casualties. The accident train departed from Dar es Salaam, the economic center, and planned to travel to the northwest of Tanzania. It derailed 508km from the starting point and 58km from the capital dodoma. Six sections of 12 car derailed, 66 passengers were injured and sent to a nearby hospital for treatment, and three others died, including a child. It was raining when the accident happened, but the cause still needs to be investigated. The person in charge of Tanzania-Zambia Railway Company said in an interview with local media that Tanzania-Zambia Railway Company will update the situation in time.

As a means of transportation with high safety factor, the train is difficult to derail. Although it seems that the train track is relatively stable, in fact, the friction between the wheels and the track is huge. The tracks are hard. When the train passes by, there will be a lot of pressure. The pressure deformed the steel to some extent. Close to the wheel, strong grip. Under special circumstances such as insufficient grip when starting or going uphill, anti-skid sand will be sprayed on the front sandbox to increase grip. Train wheels have a big inner ring and a small outer ring. Through the external extrusion force, the wheel can be more firmly attached to the track.

The causes of these accidents are very complicated, and the tracks or lines are damaged. For example, the track is uneven, with one side high and one side low. Or because of weather, natural disasters and other reasons, the track breaks or collapses. First, the lateral force of the train is too large or the vertical force is reduced. For example, at corners, it is generally increased outside the track, so that under the action of gravity, a force is generated from outside to inside, thus balancing the centrifugal force generated by turning. This process requires speed. In some places, the train will derail or the friction is not enough.

Or because of obstacles on the track or train collisions, this situation is usually difficult to happen. The train should be overhauled every time it runs, and the EMU train should be overhauled every day to ensure the safety of the train. Track regular maintenance, including regular comprehensive maintenance, sporadic emergency maintenance and patrol maintenance. The maintenance car is basically running all the time, and the road section is also inspected and maintained manually, so the safety of the track is also very guaranteed. Accidents are basically emergencies. Some irresistible natural disasters, such as mudslides, cause losses as much as discovery or timely maintenance.