keep on the rails

基本解释

By taking a constant interest in his son's progress, he helped to keep him on the rails when so many other young men were falling foul of the law.
他一直关注着儿子的成长；当许多别的年轻人违法犯案时，他总是促使他安分守已。
They need a certain amount of weight in order to keep a tight grip on the rails.
它们本来就需要相当的重量来使自己紧紧咬合住铁轨。
Fortunately, some well-staged action scenes and an emphatic performance from former television star Zo In-sung as a nice guy in a nasty line of work keep A Dirty Carnival on the rails.
幸运的是，精心设计的动作场面和明星赵寅成强有力的表演使本片取得了不俗的成绩。

So far, however, it lacks the heavy hitters—such as former American presidents—who might loosen the purse-strings and keep projects on the rails.
ECONOMIST: International aid
Outside intervention might yet keep the talks on the rails.
ECONOMIST: America at a loss
Two railway watchdogs, the Eisenbahnbundesamt (EBA) and the Bundesnetzagentur (BNetzA), try to keep DB on the rails, by checking how it manages such conflicts of interest as it allocates routes, sets timetables and schedules repairs.
ECONOMIST: German railways