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Some Southbound services that are delayed give or take 5 minutes leaving Warrington BQ would then in turn be more delayed by the LNW services from Liverpool which stop at the last 3 stations prior to Crewe (Acton Bridge Hartford Winsford). In these case the LNW services would call at P1 at Acton Bridge to allow the Glasgow train to pass. This is the only use for P1 as it is/was never timetabled as far as i can see. RTT dont seem to show platform information predictively but their last 7 days historic service does show actuals.One thing I have experienced a few times heading North, is a late running LNWR service to Liverpool calling all stations (Winsford, Hartford, Acton Bridge) being pathed in front of the Avanti service at Crewe causing the Avanti service to sit behind it and lose time.
The last time this happened by the time my Avanti service finally arrived at Wigan North Western, I would miss my connection to Barrow-in-Furness at Lancaster and the one an hour behind was cancelled so had to abandon journey and return home. I did get a full refund from Avanti hassle free though.
When i researched this last year in an attempt to see if i could predict to some extent its use it would often show 1 or 2 uses (but not in any predictive way). I do have a plan to attempt p1 but just loitering there randomly isn't it!