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
Splott the Welsh League title several times. Bridgend Street was one of the 17 streets demolished in the early 1970s, but to this day is recalled in the name of Bridgend Street Football Club, which plays in the Welsh Football League. The nickname of Bridgend Street is "The Mission" and motto is "Deeds Not Words". Their home base is The Fleurs Social Club on Portmanmoor Road. In 2016 the Tremorfa district, which had previously been included as part of Splott, became a local government community in its own right. In July 2017 the derelict citadel church collapsed with debris falling on