A diagrammatic representation of Philadelphia’s relatively complex rail system. Rather than using the traditional set of 45-degree angles employed by most transport maps, this map features 26-degree diagonals — these make the map more compact vertically and also have the added effect of making the map uniquely “brandable”. The hierarchy of line weights corresponds roughly to service frequency, with the rapid transit lines extending north, south, west and southeast from Center City forming the backbone of the system. The two halves of the Regional Rail network extending from the common Center City tracks have been given different colors to better differentiate between individual lines, which is especially apparent in the top half of the map. To denote accessible stations, the map uses the redesigned accessibility symbol developed by the Accessible Icon Project.