on the rails
In working order, functioning properlyIn working order, functioning properly.
» He fell asleep on the rails and was run over by a train.
kaiperkins271 · Tatoeba · CC BY 2.0 FRDictionary text adapted from Wiktionary (Wiktionary contributors, CC BY-SA 4.0) and Open English WordNet / Princeton WordNet (CC BY 4.0, WordNet License); shared under CC BY-SA 4.0. Example sentences and recordings are credited where they appear.