To return to the correct path or course of action after being diverted, derailed, or having made mistakes.
This phrase comes from railroad terminology of the 19th century, where trains that had derailed needed to be literally placed back on the tracks to continue their journey. The metaphorical use developed as railroads became central to transportation and commerce.
The railroad metaphor is particularly powerful because it implies both the existence of a predetermined path (the tracks) and the possibility of derailment followed by recovery. Unlike many journey metaphors, this one suggests that there's a specific, correct route to follow rather than multiple possible paths.
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