Trucks, trains and ships using hydrogen fuel cells for propulsion are no longer just theoretically possible: they have reached the trial stage.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/hydrogen-fuel-reaches-lift
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/eco-business
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hydrogen
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/renewable-energy
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fuel-cell-hydrogen
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology