I think today's use of two Class 319 units on the Liverpool - Warrington Bank Quay services marks the first electric trains on this route to carry passengers. (Or have I been guilty of not paying attention?)
Here's a couple of shots of 319365 in Platform 1 at Warrington, in between working 2F32 12:47 Liverpool Lime Street to Warrington Bank Quay and 2F31 13:51 Warrington Bank Quay to Liverpool Lime Street.
The PIS and destination displays on this unit were showing generic "Welcome to this Class 319" messages, so I didn't get a shot of Warrington Bank Quay on the display. In contrast, I was impressed to note that the platform displays at Warrington correctly labelled the service "Northern Electric".
Update: This was a one-day-only electric service using stock and crew made available by engineering works closures in Manchester, and the Warrington trains went back to diesel the following day. It'll probably be December before this becomes a regular thing, unless it can be slipped in in the 4th October timetable update.