- Financial records 1876-1959
- Costing records 1898-1959
- Engineering records including those of Barclays and the North British Locomotive Co Ltd 1878-1970
- Photographs 20th century
- Publications and publicity material including catalogues, advertisement books and journals 1912-1970
- Armstrong-Whitworth records 1931-1937
- Records of John Cochrane and Co Ltd, engine makers, Barrhead including quotation book, letter books, order and cost books, photographs and advertising material 1897-1950
- Contract lists for Barclay, North British Locomotive Co Ltd and pre-North British Locomotive Co Ltd 1837-1961
- Drawings for locomotives by Andrew Barclay locomotives (including repairs) nos. 66-2377 (incomplete), Dubs and Co (12 drawings), Neilson Reid and Co contract nos. 401-903 (incomplete), Sharp Stewart and Co contract nos. 108-1166 (incomplete), North British Locomotive Co Ltd contracts L14-999 and L1-98 (second series) (incomplete), Armstrong Whitworth and Co contracts DT1-77 plus 7 miscellaneous engines and technical drawings for Andrew Barclay and J Cochrane Standing Engine drawings
This collection is held at Glasgow University Archive Services under the charge and superintendence of the Keeper of the Records of Scotland. A full list of records in this collection can be found on the National Records of Scotland (formerly the National Archives of Scotland) online catalogue under the reference GD329.