"back on track" の定義と意味

What is the origin of the idiom "back on track" and when to use it?

The phrase 'back on track' is thought to have originated in the railroad industry, where it referred to the process of getting a train back on its normal path after a disruption or accident. The phrase has since been adopted in various contexts to describe the process of returning to a normal state after a period of interruption or difficulty.