Although electric trains have long been viewed as the most likely successor to the existing diesel fleet across Europe and elsewhere, efforts to roll them out on a large-scale are often hampered by the need to invest in expensive electrical rail infrastructure. In recognition of this limitation, a growing number of companies are actively developing hydrogen-powered trains capable of running on the existing rail infrastructure. To ensure the solution is truly eco-friendly, green electricity should be used to produce the environmentally-friendly green hydrogen
A growing number of companies are actively developing hydrogen-powered trains capable of running on the existing rail infrastructure (without the need to invest in expensive electrical rail infrastructure).
https://knowledge.energyinst.org/new-energy-world/article?id=127016