Cathays railway works the Cardiff Valleys Division, under the Loans and Guarantees Act (1929): the track layout was improved; a new corrugated roof installed; and a new ramp added to the GWR standard-pattern single-road coaling stage. By 1950 under British Railways, the combined depots of Cathays and Radyr (Code:88A), had a complement of 82 locomotives, all tank-types: 2x2-8-2T; 62x0-6-2T; 15x0-6-0T; 3x0-4-2T. In 1959 the shed was divided to cope with the introduction of diesel multiple units. In 1961 the shed closed to steam, and all steam locomotives were moved to Radyr. The shed closed completely in November 1964, with the opening of the
Fairwater, Double Bay actor Glenda Jackson, Emilio Pucci and Imelda Marcos, first lady of the Philippines. The Sydney Swans were launched at "Fairwater". In 1973 it was the scene of a ball for 1000 to celebrate the opening of Sydney Opera House. Another famous party at the house was the Concourse of Canine Elegance. Lady Fairfax was appointed an Officer of the Order of the British Empire (OBE) in 1976, a Member of the Order of a Australia (AM) in 1988, and a Companion of the Order of Australia (AC) in 2005, for "service to the community of wide ranging social and economic