They shown as GWML in a few areas in the Sectional Appendix. None of it is owned and/or maintained by MTREL, it is all owned and maintained by Network Rail apart from the CCOS (Crossrail Central Operating Section) which is owned and maintained by RFLI ( Rail for London Infrastructure). I did not remove anything from Slough. I just ran out of time with my plan was to Get from Reading to Dolphin Junction to start with. Also Elizabeth line is not tide to the Great Western Mainline Relief Lines because it can and does run on the mains. It also the Crossrail documents call it Great Western Mainline. Also it is much more commonly know as the Great Western Mainline than the Elizabeth Line or XR for short. Also the owners which are Network Rail refer to it as the Great Western Mainline. https://web.archive.org/web/20120925215820/http://www.networkrail.co.uk/browse_documents/BusinessPlan2007/PDF/Route_2013_Great_Western_Main_Line.pdf MTREL are contracted to run the trains and that is it. Also stations west of Taplow are not Managed by XR.