The collection comprises of the papers mostly accumulated by Francis Trevithick in the course of writing a biography of his father 'A Life of Richard Trevithick', published in 1872, and later additions by unknown sources. Bulk of the records are from 19th century. Later additions of 20th century records are by unknown sources and consist mainly of printed materials. (see TREVF/5).

Papers include original and copy letters from different senders on various topics including Richard Trevithick’s time in South America, his work on steam pumps for mines and his involvement in the development of steam locomotives. Also in the collection are various maps and plans, generally of engines and pumps designed by Richard Trevithick, photographs relating to the Trevithick family and notes compiled by Francis Trevithick in the writing of the biography. The collection also includes a selection of published works relating to Richard Trevithick in the form of books, articles from journals and newspaper cuttings, some of which date from the 1970s.