Half of this article focuses on the tautological notion that since the term ghost train is a made up one with no meaning that nobody in the railways recognises, then it must be about a hidden thing that nobody knows about, and you can tell this is so because nobody knows the term. Even the attempted definition of "so infrequent as to be useless" appears not to fit the headline run, which is once a day six times a week - I know packed commuter lines that are less frequent!