Twilight of Steam in Ulster features a further selection of the films made by John Laird, who set out in the early and mid-1960s to record as much as he could of the remaining steam workings on Ireland's 5ft 3in standard gauge railways. Whilst the diesels ruled unchallenged on the CIE system in the Irish Republic, a considerable variety of steam locomotives and steam workings could still be experienced on the railway network in Northern Ireland, which was run by the Ulster Transport Authority. This programme looks at some of the workings frequently entrusted to steam and some of the lines where steam was still very active. A long section is devoted should be to the loose coupled steam hauled goods trains which would soon pass into history. The dock lines in Belfast are explored and in a country where industrial railways were rare, a special sequence features the pair of 5ft 3in gauge Pecket saddletanks, which were employed by Courtaulds at Carrickfergus in County Antrim. Other aspects of steam portrayed are special workings and excursions, steam hauled suburban services and the use of steam locomotives on the branch from Goraghwood to Warrenpoint and the Great Northern line to Derry - the two lines which closed in 1965 and which are still mourned by railway enthusiasts. This programme completes John Laird's trilogy on transport in Ulster in the 1960s. Along with the companion volumes irish Railways 2 -The Swansong of Steam in Ulster, and Trolleybus Days in Belfast, both published by Midland and Online, John Laird has made a significant contribution to the recording of the recent social history of the province, and provided a wealth of pleasure and nostalgia for all of those interested in transport.