Materials relate to management activities, as well as projects such as underground light railways and products. Reports, photographs, drawings, manuals, advertising materials, memorandums, visitations, forecasting, accounts, letters, catalogues and data sheets are all included. Material covers the UK, Sudan, Australia, Canada, Philippines, Chile, Angola, Korea and Zambia.
With some additional materials relating to Oakdale Associates, a company set up by ex-Raletrux employees when it folded in 1984, including Michael Theakston who the Hudson material was collected by.