These tracks, the Cromwell Curve, were opened without Parliamentary authority in an unsuccessful attempt by the DR to improve its share of the revenues between High Street Kensington and South Kensington stations which were divided on the basis of mileage of track owned by the two companies.
Disse spor, kaldet Cromwellkurven, blev åbnet uden parlamentarisk godkendelse i et forgæves forsøg fra MDR for at forbedre deres andel af omsætningen mellem High Street Kensington og South Kensington Stationer, der blev opgjort på basis af længden af spor ejet af de to selskaber.