The Cromwell Curve was a short section of railway line on the London Underground between Gloucester Road and High Street Kensington stations. The line was opened by the District Railway (DR) on 5 July 1871. The tracks formed a triangle across the end of the ∨ connecting the District's existing routes from Earl's Court station to Gloucester Road and High Street Kensington, and ran in a cutting parallel to the Metropolitan Railway (MR). The name derives from Cromwell Road which is immediately south of the site of the curve.