This image is a derivative work of the following images: File:London_Underground_full_map.svg licensed with Cc-by-sa-2.5,2.0,1.0, GFDL 2009-05-31T00:05:06Z
zones for London Overground may be inaccurate. Date 28 April 2019 Source File:LondonUndergroundfullmap.svg, File:London Overground 2013.png, File:Tramlink
State of the Map U.S. 2022 Spanish las diapositivas y notas de la presentación “Las lecciones del taller de señales” en el State of the Map EE.UU. 2022