- 1Papers accumulated by Robert Young and Edith Mary Young (nee Lees) (HACK/5)
c 1825 - 1934, sub-fonds - 2Correspondence and accompanying documents accumulated by Robert Young and Edith Mary Young (nee Lees) (HACK/5/1)
4 November 1882 - 10 November 1934, series - 3Research papers of Robert Young (HACK/5/2)
c 1825 - c 1925, series - 4Publications (HACK/5/2/1)
1856 - 1929, sub-series - 5Papers collected (HACK/5/2/2)
1856 - 1929, sub-series - 6Material from Robert Young Pickering (HACK/5/2/2/1)
10 July 1827-1872, sub-sub-series - 7Material from Samuel Holmes (HACK/5/2/2/2)
29 June 1892-13 April 1920, sub-sub-series - 8Material from G.W.J. Potter (HACK/5/2/2/3)
6 January 1908-13 April 1908, sub-sub-series - 9Material from various (HACK/5/2/2/4)
19th century, sub-sub-series - 10Notebooks (HACK/5/2/3)
c 1910 - 1923, sub-series - 11Draft chapters, appendices and notes (HACK/5/2/4)
November 1829 - 1923, sub-series - 12Proofs and drafts (HACK/5/2/5)
c 1923, sub-series - 13Illustrations (HACK/5/2/6)
c 1920 - 1923, sub-series - 14Illustrations collected for Timothy Hackworth and the Locomotive (London: Locomotive Publishing Company, 1923) and included in the 1st edition (HACK/5/2/6/1)
c 1920 - 1923, file - 15Copy and original illustrations collected for but not included in Timothy Hackworth and the Locomotive (London: Locomotive Publishing Company, 1923)(1st edition) some images may have been included in 2nd and 3rd editions (HACK/5/2/6/2)
c 1920 - 1923, file
