Something Wrong?

Since midday on Tuesday, no passenger trains have used the Up Fast through Roby and Huyton platforms three.  Trains for the St Helens route have used platform four as usual, trains for the Chat Moss route have also used platform four, and crossed over after Huyton.  Here's Wednesday's 12.14 departure from Huyton with the appropriate feather:

My first thought on Tuesday was that there was a track or signalling fault on the Up Fast, but an ECS on Tuesday evening, and another one on Wednesday ran along there OK.  So my best guess is a lift fault or something similar.  I couldn't see any sign of this at Huyton, maybe it's at Roby.  Or perhaps someone's made a decision that all up stoppers will use the slow line.  They've not done that in the past on the down lines.

Most freights are also using the up slow, although one late on Wednesday evening used the fast.  Here's 6E10 on its way to Drax on Wednesday lunchtime: