sentences:  The Telford New Main Line modifications following his 1824 survey cut through many of the bends of the Old Main Line, including bypassing the Oozells Street loop, so that Old Turn Junction became the meeting of four branches.The island was installed during World War II, to allow the use of temporary dams to protect the railway tunnel beneath it, should the canal be breached by bombing.The north tunnel of the Stour Valley railway line (main western approach to New Street Station) runs a few yards north east of the junction, under the Birmingham and Fazeley Canal.