This question is not related to Tesla. But it is related to the electric vehicle. I was reading about hydrogen fuel cell trains (https://www.hydrogenics.com/hydrogen-products-solutions/fuel-cell-power-...) recently. That is when I thought of searching whether Elon Musk has any plan to manufacture train. I saw some articles about his proposed train model called "Hyperloop". So what exactly is it? Will it be a reality any time soon?