1506 wrote:

IMHO extending the East London Line to Queens Park makes sense. And,
moreover extending them on to Watford makes better sense.

That depends. Is it replacing the Euston-Watford service, or as well as
it?

It would be
easier then extending the Bakerloo to Watford. The route could be
third rail throughout, except for the short joint Bakerloo stretch.

Watford to west Croydon by way of Whitechapel trains could open up a
world of travel and interchange possibilities.

Such as...?

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