When did Charles Pearson build the first subway train?

Charles Pearson, an English lawyer and reformer, did not build the first subway train himself; however, he was a key advocate for the development of underground railways in London during the mid-19th century. His ideas contributed to the establishment of the London Underground, which opened its first line, the Metropolitan Railway, on January 10, 1863. Pearson's vision and efforts were instrumental in the realization of this significant urban transportation project.