In article , Theo Markettos
writes
A cross London trip from Waterloo to St Pancras results in a recommendation
to change trains four times.

Waterloo(trains)-Waterloo(LU)-Euston(LU)-Kings Cross(LU)-St Pancras
(trains)

That's not four changes. It's saying:
Walk from Waterloo concourse to Waterloo tube
Catch a train to Euston (tube)
Change to a train to King's Cross (tube)
Walk to St Pancras concourse

However, it's not the optimal route, which is to change at Oxford Circus
(where the change is short and on the level, while at Euston it is up
stairs, a long walk, and then down an escalator).

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