I have to give your Lordships a brief description of railway geography in west London. The Great Western main line at Old Oak Common has two pairs of tracks. One is called the main line and the other the relief lines. The Elizabeth line now runs on the relief lines and, as my noble friend said, Great Western main line trains run on the main line. However, two of those four tracks sometimes close for maintenance, and if platforms were not built on the main lines, even in the interim period before HS2 provides the full service that it one day will, the station could not be operational because Elizabeth line trains could not stop on the main lines. So it is essential to have platforms on both sets of tracks, and in the long term, when HS2 is operational and serves a whole variety of destinations in northern England, stopping Great Western Railway trains there will be useful to railway passengers.