Records relating mainly to the industrial concerns of the Crawshay family of Cyfarthfa, Merthyr Tydfil, Glamorgan, [1706]-1878, including leters and letter books of William Crawshay I and II and Robert Crawshay, 1806-1877; cash books, ledgers and bankers drafts, 1834-1888; deeds, [1706]-1885; wills, deeds and miscellaneous material, 1801-1838; balance sheets for ironworks, 1810-1867; will, valuation and probate for William Crawshay II, 1865-1869; shares and bills of exchange, 1870-1878; and Hilston Park estate papers, 1838-1862 and Caversham Park estate papers, 1826-1864. The archive represents the working papers of a major ironworking dynasty.

Notices, 1897-1898, to Maurice John (Jones) Lewis, Glansevern Arms, Llangurig, of properties in the parish of Llangurig liable to be taken compulsorily for the East and West Wales Railway; a holograph letter from Stuart Rendel to Maurice J. Lewis, Nanty Mines, Llangurig, 1881 (not in the way of seeing people with an interest in the mines); and a notebook containing a list of subscribers in [the township of] Llanyfini towards the celebration in the parish of Llangurig of the coronation of King Edward VII, 1902.

Registers of shareholders, bonds, mortgages, and debentures of proprietors of railway companies in Wales and the Borders which became incorporated in the LMS Railway Co., comprising the following: Bangor and Caernarvon Railway, 1854-1866; Brynmawr and Blaenavon Railway, 1868-1869; Carnarvon & Llanberis Railway, 1864-1871; Carnarvonshire Railway, 1863-1871; Central Wales Railway and Central Wales Extension Railway, 1862-1887; Chester and Holyhead Railway, 1844-1857; Conway and Llanrwst, and Merthyr, Tredegar, and Abergavenny Railways, 1866-1869; Denbigh, Ruthin, and Corwen Railway, 1861-1890; Hereford, Hay, and Brecon Railway, 1864-1871; Knighton Railway, 1860-1869; Merthyr, Tredegar, and Abergavenny Railway, 1861-1866; Mold Railway, 1849-1852; Shrewsbury and Welshpool Railway, 1860-1867; Shropshire Union Railway and Canal Company, 1848-1852; Sirhowy Railway, 1860-1880; Swansea Vale Railway, 1852-1880; Vale of Clwyd Railway, 1859-1868; and Vale of Towy Railway, 1853-1885.

Papers relating to T. E. Owen and his father T. Owen, 1820-1936, including diaries and memorandum books, 1820-1905; correspondence, 1878-1907; a time-book of men building the railway bridge over the Rheidol, 1887, kept by T. E. Owen; monthly summaries of materials used, 1880-98; hay account, l873-1899; printed reports of the Manager and Receiver of the Manchester and Milford Railway, 1882-1894; statements of accounts, 1881-2; rules and regulations of the railway, 1865, 1897; rules of the M. & M. Railway Friendly Society, 1868; balance sheets, 1877-1904; plans and photographs of buildings, rolling stock and personnel.

A typescript undated copy containing the words for eight songs including 'The wild wild railroad man or the ballad of Richard Hilton, 'Pen Cob races' and 'Blaenau town ride', [1930]-[1960].