From a contemporary illustration (1808). Recent archaeological evidence indicates that the event took place on a site in Bloomsbury, London, now underneath the Chadwick Building, University College London. This is off Gower Street, (opposite University Street, previously Carmarthen Street).

Trevithick's steam circus on which ran the locomotive "Catch me who can". There is evidence that this "illustration" is not contemporary but was made long after the event. See the Catch me who can talk page and the Richard Trevithick talk page about this matter.

Sourced from http://www.spartacus.schoolnet.co.uk/RAcircular.htm

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