Good few years ago I saw a 158 running a Hexham - Middlesbrough service, boarded at Seaton Carew!
Don't know if this is unusual but on Monday saw a class 170 between Stourbridge and Kidderminster as a service train also a 153 and 172 working in multiple
Since the timetable change that is perfectly normal. There is one diagram using 170/6+153, one as 2x170/6 (starts as 07:35 WOS-DDG); and I wouldn't be surprised if there was a 172+153 diagram all on the Snow Hill lines.
Probably not that unusual but noticed a class 444 and class 450 coupled today, heading towards Weymouth, with the 450 at the London end
Had a CrossCountry 170 on a Manchester service once, formed of 170519 and 170520!!
An improvement!
Probably at about the same time there were two 158s in non-Northern liveries, one was on the MetroCentre - Morpeth train.

Since the timetable change that is perfectly normal. There is one diagram using 170/6+153, one as 2x170/6 (starts as 07:35 WOS-DDG); and I wouldn't be surprised if there was a 172+153 diagram all on the Snow Hill lines.
Saw a 10 car FCC depart the sidings at Hertford North one night bound for Hornsey EMUD - consisting of:
2 x Class 313s
1 x Class 317
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I thought the couplers were incompatable? Can they work with 321's as well?