BNSF and Caterpillar and Chevron are teamed on a hydrogen fuel cell locomotive demonstration project to show hydrogen is a viable alternative fuel source for line haul rail

 https://www.caterpillar.com/en/news/corporate-press-releases/h/caterpillar-BNSF-chevron-hydrogen-locomotive-demonstration.html

https://www.trains.com/trn/news-reviews/news-wire/bnsf-to-join-caterpillar-chevron-in-hydrogen-fuel-cell-project/