PC London Overground: Mildway Line Aka North London Line (tsw5)

Do TFL Class 378 still rarely run on Watford DC line? If not then, some of these services shouldnt be here.

Please do correct me if im wrong.
I have attached sceenshots. PS i dont think having a Class 378 for service "5Q54: Northampton - Willesden" is correct as why would TFL go outside its confort zone

 

sorry. didnt relise there already a thread post dicussing "
London Overground: Mildway Line Aka North London Line (tsw5)
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A headcode starting with 5 is an empty coaching stock maneuver. And just north of Northampton station is King's Heath Depot, where it appears electric trains get serviced.
That's off some quick research. I don't know exactly what they do at Kings Heath Depot, but it could be part of a maneuver that's getting a 378 back into it's comfort zone.

 

The London Overground fleet is usually serviced at Bombardier's facility at Ilford Depot. I don't know whether there's a wheel lathe at King's Heath Depot, that's one of the jobs that doesn't have be undertaken by Ilford especially if theirs is busy.