It is super steep, but it&#x27;s not unprecedented. Several Swiss railways have extended 7% grades and have been operating for over a century.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Bernina_railway" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Bernina_railway</a> for instance<p>The problem with steep railway lines is generally BRAKING, not climbing. Norfolk Southern ran freight up and down the Saluda grade in NC for over 100 years, and that&#x27;s at nearly 5%.