«Steam train anniversary begins». BBC News. 21 February 2004. http://news.bbc.co.uk/1/hi/wales/3509961.stm. Ανακτήθηκε στις 13 June 2009. «A south Wales town has begun months of celebrations to mark the 200th anniversary of the invention of the steam locomotive. Merthyr Tydfil was the location where, on 21 February 1804, Richard Trevithick took the world into the railway age when he set one of his high-pressure steam engines on a local iron master's tram rails»
