Off-the-wall idea while thinking about Preston station, I wonder if there's a ready-made solution as to where to terminate the Blackpool South trains if these were ever converted to tram-trains....
It seems there is a hidden siding under the taxi ramp which connects to the undercroft subways. It's briefly discussed at
<p>Underneath Preston Station there is a little known area, the bakehouse siding. The siding is still there as of 2023….</p>
www.blogpreston.co.uk
Looks to me as if using this (assuming it's wide enough) would minimise conflicts at the north end of P1/2 and keep the trams out of the way
It was known as "the bakehouse siding" and here's a photo (not mine)
View attachment 209332
and an old map showing the location
View attachment 209333