Today's Railways UK regularly accompany articles on rail services with a map to illustrate a geographical area. For instance, the current May 2015 edition has a feature on the Worcester - Hereford line. These rail maps are "lifted" direct from Platform 5 Publishing's Track Atlas. These maps feature a symbol of an orange dot in various locations on the map itself: between the tracks on a double track route; to one side on single lines. However it is never explained what this orange dot symbol actually means - there is no key provided. Can someone who owns a copy of the full atlas -which does, presumably, feature a key- tell me what the orange dot means, please? Thanks in advance for any help!