Originally built as a single track line, the route between Leamington and Kenilworth was widened to double track in 1884 and the stations at Milverton and Kenilworth were rebuilt; however, the section from Kenilworth Junction to Gibbet Hill Junction, just south of Coventry, remained single track. At the same time, a new cut-off line known as the "Berkswell Loop" was opened from Kenilworth to on the Coventry-Birmingham line. This line avoided Coventry and allowed the LNWR to introduce a direct Leamington to Birmingham service.