Ten examples of railway signals. A thematic selection of designs, not an operational railway guide. All visuals are licensed photographs. File:Semaphore Railway Signal - geograph.org.uk - 285124.jpg: Hywel Williams; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0; https://commons.wikimedia.org/wiki/File:Semaphore_Railway_Signal_-_geograph.org.uk_-_285124.jpg; Scaled and letterboxed without cropping. File:Celje-German two arm mechanical railway semaphore signal-from east.jpg: Ajznponar; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Celje-German_two_arm_mechanical_railway_semaphore_signal-from_east.jpg; Scaled and letterboxed without cropping. File:Semaphore Lartigue ferme.jpg: Didier Duforest; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Semaphore_Lartigue_ferme.jpg; Scaled and letterboxed without cropping. File:Disc signal, Portrush - geograph.org.uk - 3085986.jpg: Albert Bridge; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0; https://commons.wikimedia.org/wiki/File:Disc_signal,_Portrush_-_geograph.org.uk_-_3085986.jpg; Scaled and letterboxed without cropping. File:CR Lehigh-Line-signal-1222.jpg: Sturmovik at en.wikipedia; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:CR_Lehigh-Line-signal-1222.jpg; Scaled and letterboxed without cropping. File:PRR dwarf PL signal 001.jpg: Caseyjonz; Public domain; ; https://commons.wikimedia.org/wiki/File:PRR_dwarf_PL_signal_001.jpg; Scaled and letterboxed without cropping. File:CPL on the Metrpolitan Division (6939862333).jpg: jpmueller99 from Shenandoah Valley of VA, USA; CC BY 2.0; https://creativecommons.org/licenses/by/2.0; https://commons.wikimedia.org/wiki/File:CPL_on_the_Metrpolitan_Division_(6939862333).jpg; Scaled and letterboxed without cropping. File:Russian dwarf railway signal Kutuzovo Ch1.jpg: Сергей Крылов (Toman); CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Russian_dwarf_railway_signal_Kutuzovo_Ch1.jpg; Scaled and letterboxed without cropping. File:Railway signal FE6453 - geograph.org.uk - 7498570.jpg: DS Pugh; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0; https://commons.wikimedia.org/wiki/File:Railway_signal_FE6453_-_geograph.org.uk_-_7498570.jpg; Scaled and letterboxed without cropping. File:Colour light signal, Coleraine station - geograph.org.uk - 2323030.jpg: Albert Bridge; CC BY-SA 2.0; https://creativecommons.org/licenses/by-sa/2.0; https://commons.wikimedia.org/wiki/File:Colour_light_signal,_Coleraine_station_-_geograph.org.uk_-_2323030.jpg; Scaled and letterboxed without cropping. Adaptation: CC BY-SA 4.0. Original photographs retain their stated licenses. https://creativecommons.org/licenses/by-sa/4.0/