Why did the SS leave the men on the train for so long in chapter 7 of the book 'Night'?

The SS left the men on the train for an extended period during chapter 7 of 'Night' as a means of control and punishment. They wanted to instill fear and assert their authority over the prisoners by subjecting them to harsh conditions and uncertainty. This tactic was used to dehumanize and weaken the prisoners both physically and mentally.