Britain is looking to become one of the next countries to start running hydrogen-powered trains.Read more
Transport correspondent, BBC News
With zero emissions and water as a by-product, Tom Burridge was on board one of the test runs.
Trains that emit pure water could be in the UK by the "early 2020s", according to the government.
Scientists at Swansea University have come up with a plan to reuse plastic in a environmentally friendly way.