Highly detailed transit map, showing all of the operating lines of the Pacific Electric Railway Company, each having been shaded in red, yellow, white, green, pink or blue, with a key at the lower right naming each of the routes.
The present map was prepared and annotated by the Pacific Electric Railway Company and was part of an archive of maps de-accessioned by the Southern Pacific Railroad Company in the 1980s.
In the area around West Covina, there are a number of manuscript annoations. A key at the top right notes "OFF LINES".
A number of other railroad lines are shown, along with city names and early roads, rivers, etc. A remarkably informative early map.