On 1 April 1869, the broad gauge was taken out of use between Oxford and Wolverhampton and from Reading to Basingstoke. In August, the line from Grange Court to Hereford was converted from broad to standard and the whole of the line from Swindon through Gloucester to South Wales was similarly treated in May 1872. In 1874, the mixed gauge was extended along the main line to Chippenham and the line from there to Weymouth was narrowed.