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 two generations, Sir James Oswald Fairfax (1863-1928) and Sir Warwick Oswald Fairfax (1901-1987), of managing directors of this family publishing company. The association between "Fairwater" and the Joseph family in view of the family's notable commercial and political achievements. The association between "Fairwater" and the retention of a land title boundary, which fronts Port Jackson. The location of "Fairwater" within an area of heritage items and its contribution to this waterfront precinct of high aesthetic value. The location of "Fairwater" on the foreshore of Double Bay in consideration of the views of Port Jackson. The hard landscaping feature of the