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Extreme caution is required! ▶ SUBSCRIBE: https://www.youtube.com/c/ngcpl?sub_c... ▶ See also: • Crossing failure could have led to ... ▶ For broadcast dates and reruns, visit https://www.natgeotv.com/pl ▶ Follow us on Instagram: / nationalgeographicwildpl ▶ Join us on Facebook: / ngcpl Brave crews battle ruthless weather and treacherous terrain to keep trains moving along the most extreme route in all of Canada. #nationalgeographic #natgeopl #ekstremalnakolejgórskalistych