About 1000 volumes, 6000 boxes and about 1000 maps and plans, including minute books, ledgers, journals, cash books, traffic receipts, etc. for Belfast and Co. Down Railway, Belfast and Northern Counties Railway and many smaller networks, also including accounts for railway hotels, c. 1846-1950.

Míreanna comhchosúla

• A collection of maps and sections of proposed railways from Belfast to Dublin, Ballymena, Armagh, various places in Co. Down and from Dublin to Armagh, 1835-54. Map of Ballydownfine, Co. Antrim, 1830.
• Maps and plans of Londonderry and Larne Railway, 1880-1, Larne and Antrim railway and Ballymoney and Ballycastle railway.
• "Photostat" copy of a map of the country southwards from Strangford Lough to Dundalk along the coast, giving acreage in the lordships of Cooley, Omethe, Mowrne and Newrye and showing woods. Presumably by Lythe about 1570.
• Dublin and Belfast Junction Railway. Townlands of Ballyworkan, Tavanagh and Corcrain (Co. Armagh), n.d.
• Plan of the proposed line of the West Clare Railway, 1884.