What is the origin of the idiom "on the right lines" and when to use it?

The origin of the idiom "on the right lines" can be traced back to the railroad industry in the 19th century. In the early days of rail travel, it was essential for trains to stay on the correct track to avoid accidents and reach their intended destination. Over time, this phrase became more widely used to describe any situation where someone is moving towards success or following the correct course of action.