Get back on the rails
Definition 1 of 1
Pro Tip 1/3Metaphorical Use
The phrase is used metaphorically to mean returning to the right path, like a train back on tracks. 
She lost focus during her studies, but finally got back on the rails.
Pro Tip 2/3Positive Connotation
This phrase carries a positive meaning, suggesting improvement or correction of a situation. 
After the budget review, our finances got back on the rails.
Pro Tip 3/3Not Literal
Don't confuse it with its literal meaning; it's not about actual rails, but about fixing problems. 
The production line failed, but we got it back on the rails in no time.