 The 1930s brought hard times, and the records set by the Castles and Kings were surpassed by other companies, but the company remained in relatively good financial health despite the Depression.In 1933, the Great Western Railway introduced the first of what was to become a successful series of railcars, which survived in regular use until they were replaced by British Railways in the 1960s.The original design featured 'air-smoothed' bodywork, which was very much the fashion at the time.