American Morse Code Guide
Learn the original American Morse Code and understand its distinctive timing and railway history.
Try American Morse in the main translator.
Choose “American (Continental)” from the standard selector. Three spaces separate letters because some American Morse characters contain an internal pause.
Open the TranslatorWhat is American Morse Code?
Also known as Railroad Morse, American Morse was the first telecommunication code developed by Samuel Morse and Alfred Vail in the 1830s. Unlike the International standard, American Morse relied heavily on internal timings and spacing within characters, meaning a single letter could have unexpected pauses.
Internal Spacing
In international Morse, gaps between dots and dashes in a single letter are constant. In American Morse, letters like 'C', 'O', and 'R' used internal spacing. For example, 'C' was sent as "__ . . _ ." which made it difficult for inexperienced operators.
Why Did It Decline?
As telegraph cables crossed the ocean to Europe in the 1850s, the American code's lack of support for diacritics and its complex internal timings proved problematic. An 1851 conference drafted the 'Continental' or 'International' Morse Code, which became the global standard. However, American Morse continued to be used by the US railroads until the mid-20th century.