On August 26, 1989, a train in south africa carried a record number of 660 cars. what was the length of the train?

To find the length of the train, we need to know the length of each car. Unfortunately, the given information only mentions the number of cars in the train but not their individual lengths. Therefore, without knowing the length of each car, we cannot determine the overall length of the train.

It depends on the length of each wagon, and if there are multiple storeys/layers, and the lengths of the cars.

Assuming no multiple storeys, and an average of 6 metres per car, with no car transported side-by-side, and ignoring the distance between wagons, we have
6*660m = 3960 m = 4 km (approx.)