The last decades of the 19th century and those of the early 20th century were the heyday of urban rail transit around the world. These remarkable maps from the University of Chicago Library's Map Collection illustrate the history of such matters between the 1860s and the 1920s. On its homepage, the site offers a bit of historical context on the development of such systems and visitors would do well to read this area first. In total there are almost two dozen maps, including one of London's District Railway in 1885 and a fine map of Chicago's street car lines in 1897. Visitors can look over the provenance information for each document or read a brief description of each map as well.