Verkehrsplan der Stadt Frankfurt von 1956, Verlag Richard Schwarz KG (1956), from www.tramfan-ffm.de, showing Straßenbahn (trolley) and bus lines as of 1956, which were very close if not identical to those of 1959-61, before the subway and light-rail system was built starting in 1963 and opening in 1968, replacing many of the trolley lines, with further expansion later. On this map the trolley routes are shown as solid blue lines with blue numbers such as 17; at an Endstation (terminus) the number is circled. The map does not show the Platenstraße housing area or the American high school, indicating the "plat" content of the map (buildings, etc) dates from 1954 or earlier.