Cathays railway works unit for No. 1 steam railcar, in 1903. However, the TVR still needed a carriage and wagon works, so reliant were they on the transportation of coal. Ideally located close to Cardiff Docks, the site chosen was just north of Cathays railway station, as the line headed towards Llandaf railway station, in the Cathays suburb of Cardiff. A 6-road facility north of the TVR mainline, the carriage and wagon works were capable of both producing and maintaining the complete TVR and private owner range of rolling stock. The works was assured of work, as the TVR handled some 10,000 coal
Crown Buildings, Cathays Park twenty years. In 1934–8, the block now known as Cathays Park 1 (a.k.a. CP1 or old Crown Building) was built by P. E. Hanton, as offices for the Welsh Board of Health. It is a three-storey building in the Stripped Classical style, with of floorspace. It also has an attic and a basement. Cathays Park 2 (a.k.a. CP2 or new Crown Building) is a five-storey office building with of floorspace, including an underground car park and a central atrium housing a cafe for the office staff. The "Encyclopaedia of Wales" describes CP2, completed in 1979, as conveying an impression of