In 1923 the main line railways of Great Britain were grouped, pursuant to the
Railways Act 1921. Four new railway companies were established, and the Cambrian Railways and the pre-existing Great Western Railway were constituents of the new Great Western Railway. As it was effectively part of the Cambrian Railways the Wrexham and Ellesmere Railway passed into Great Western Railway ownership. In due course the line was classified as Dotted Blue for route availability purposes. The new owners spent some money on improving the line, introducing the Electric Train Tablet system of signalling the single line, in place of the former Train Staff and Ticket system. A new halt was opened at
Hightown, near Wrexham, and later at Cloy, Elson and Pickhill. However the passenger operation on the line was plainly loss-making, and the eliminated the staffing at the intermediate stations, which became unstaffed halts. The motor-trolley system of track maintenance was introduced. The Wrexham end of the line was at the old Wrexham, Mold and Connah's Quay terminus, now converted to a through station. Notwithstanding the sponsoring companies' objective, of by-passing the route, it was not until 1895 that a west-to-north spur at Ellesmere was authorised in Parliament. In fact it was not much used, and was soon closed, reopening in 1905. The lengthy and awkward route for heavy coal shipments from South Wales discouraged the LNWR from developing the traffic on this axis. There was some through passenger traffic from the Great Central Railway (as the MS&LR had become) system to Aberystwyth, but local traffic was small and the line's income was correspondingly limited. ==World War II==