L Glossary of rail transport terms
^ thomas j. michie, ed. (1913). mackenzie v. new york cent. & h. r. r. co. . railroad reports: collection of cases affecting railroads of every kind, decided courts of last resort in united states. 67. charlottesville, va: michie company. pp. 315–316.
^ railroading glossary: l . trn.trains.com. kalmbach publishing. archived original on 26 august 2014. retrieved 20 february 2013.
^ light rail? . lrta.org. light rail transit association. retrieved 6 july 2009.
^ grutzik, joe (2005). adventure lessons: teachings of existential vagabond. los angeles, california: & brown publishers. p. 34. isbn 0-9768915-1-4.
^ elliott, w. h. (january 1906). signaling . railroad men. xix (4): 128–137.
^ solomon, brian (2003). railroad signaling. mbi publishing company. p. 48.
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