Morse ya yi tafiyarsa ta ƙarshe zuwa Washington, DC, a watan Disamba na 1842, yana "ɗaura wayoyi tsakanin ɗakunan kwamiti biyu a cikin Capitol, kuma ya aika saƙonni gaba da gaba" don nuna tsarin telegraph ɗin sa. Majalisa ta ba da dala 30,000 a 1843 don gina layin telegraph na gwaji mai nisan mil 38 (61 km) tsakanin Washington, DC, da Baltimore tare da haƙƙin hanyar hanyar Baltimore da Ohio Railroad. Wani zanga-zanga mai ban sha'awa ya faru a ranar 1 ga Mayu, 1844, lokacin da aka ba da labari game da nadin Jam'iyyar Whig na Henry Clay a matsayin Shugaban Amurka daga taron jam'iyyar a Baltimore zuwa Ginin Capitol a Washington. Tambaya: Yaya tsawon lokacin da aka amince da layin telegraph na 1843 wanda ya gudana tsakanin Washington DC da Baltimore?
Tazarar mil 38