In message .com,
TheOneKEA writes

You've got it _completely_ backwards - there's no tipping-out required
at all.

A driver at King's Cross n/b makes an announcement, then proceeds
towards signal J10, which has a lit No.4 feather. The train will
proceed straight ahead into the original C&SLR n/b tunnel, bypassing
the 1960s tunnel built to divert the n/b Northern to make space for
the Victoria Line tunnels. This tunnel leads to the original scissors
crossover cavern south of Euston, where the train uses a facing
crossover to switch to the s/b line and pull into the s/b platform at
Euston, where he stops and changes ends.

What's a No.4 feather when it's at home?

London Underground have Arbour Lights on signals - not feathers.
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Steve Fitzgerald has now left the building.
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In article , Steve M
writes
I have never seen a loop on a Quail map at Euston.
It's not a loop as such... IIRC, terminating trains tip out at Euston,
cross over to the other line,

This connecting track is called "the Euston Loop".

and then onto the bit of track which links the Northern with the
Piccadilly Line.

And this one is called the "King's Cross Loop".

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