 undar ‌ grounded rel ‌ roed antey emti ?
 undar ‌ grounded rel ‌ roed anede  19 va sathabdam prarambham nundi madhyakalam varku uunited stetes ‌ loo sthapinchabadina rahasya margalu mariyu surakshita gruhaala nett ‌ varey .  baanisalugaa unna african amerikanlu dheenini pradhaanamgaa svechcha rastralu mariyu kenadaaloki tappinchukoovadaaniki upayoginchaaru .  nett ‌ varey ‌ ku nirmuulanavaadulu mariyu tappinchukunnavaari kaaranaaniki saanubhootigala Bundi sahayam chesar .  tappinchukune pramaadamloo unna banisa vyaktulu mariyu variki sahayam chosen varini kudaa samishtigaa  " undar ‌ grounded rel ‌ roed "  ani pilustharu .  vividha itara margalu meksikoku dhaaritheeshaayi ,  akada banisatwam raddhu cheyabadindhi mariyu banisa vyaapaaramlo bhaagam kanni carribean ‌ loni dveepaalaku dhaaritheesindhi .  dakshinhaana phloorida vaipu vellae munupati tappinchukune margam ,  tarwata spanish swaadheenam  (1763-1783  minahaa ), 17 va sathabdam chivari nundi sumaaru  1790  varku unikilo Pali .  ayithe ,  ippudu saadharanamga bhugarbha rel ‌ roed ani piluvabadee nett ‌ varey  18 va sathabdam chivarilo prarambhamaindi .  adhyakshudu abraham lincon chetha vimochana prakatanapai santhakam chese varku idi uttaraana nadichindi mariyu sthiramgaa pergindhi .  ooka anchana prakaaram  1850  natiki ,  dadapu  100,000  mandhi baanisalugaa unna prajalu nett ‌ varey dwara svechchanu pondhaaru .
 undar ‌ grounded rel ‌ roed anede uunited stetes ‌ loo  19 va sathabdam praarambhamlo sthapinchabadina margalu mariyu surakshita gruhaala rahasya nett ‌ varey ,  idi svechcha rastralu ,  kanada ,  mxico mariyu itara videsi praantaalaku dhaaritheesindhi .  nallajati banisalu banisatwam nundi tappinchukoovadaaniki bhugarbha railumarganni upayoginchaaru . 1850  natiki ,  sumaaru  100,000  mandhi banisalu  " rel ‌ roed "  dwara swatantrayam pondaarani anchana .