Changes

'''6990 Witherslack Hall ''', a BR(W) 6959 Class 'Modified Hall', is owned by The David Clarke Railway Trust (DCRT) and is based at the Great Central Railway.<ref name=GCR>[http://www.gcrailway.co.uk/the-railway/locomotives/6990-witherslack-hall/ GCR Website] Retrieved 3 December 2018</ref>

The original GWR 4900 Hall Class, of which the SVR’s [[GWR 4930 Hagley Hall|4930 Hagley Hall]] is an example, was first built in the 1920s and the design remained largely unchanged until C.B. Collett retired in 1941. Frederick Hawksworth, his successor as CME, produced the 6959 Modified Hall class Class of which 71 were built between 1944 and 1950. Although visually similar to the earlier Halls, the modified version incorporated many changes including a re-design A description of the frames incorporating plate frames, cylinders cast separately from the smokebox saddle and bolted to the frames Class can be found on each side, and increased superheating. Hawksworth also produced a re-designed tender with flat high sides, and a number of the Modified Halls were equipped with these[[GWR 6960 Raveningham Hall|6960 Raveningham Hall]] page.