pokemonsuper9
Established Member
I think they're for route knowledge retentionEmpty stock, rather than for passengers, but Northern has 2 return paths between Wigan North Western & Warrington Bank Quay via Earlestown. I assume these are for test runs after "exam" or "repairs". Sometimes, as today, it goes no further than Earlestown (331.021 acoording to RTT), but Class 331s are rare visitors to Warrington BQ.
They only run sometimes
What was used for it last time? 156? 158?