It was built while Kingsway was being constructed, so presumably had
wayleaves where not under the new road.
Was the constraint about lines not running under buildings a legal
limitation, or a prudent decision by the tunnellers to minimise the
chances of being subsequently sued by building owners over cracks that
developed once the trains were running?
The issue was probably one of obtaining wayleaves. The owners of property
own the land below to the centre of the earth, with certain limitations,
e.g. for mineral rights. So maybe the GNPBR was able to negotiate some
wayleaves but only on that one section?
They were only responsible for Holborn northwards. And yes, they had
clearly gained permission for the most egregious non-road section
from Russell Square to Kings Cross.
Ah, yes. That section was the GN&S. But the construction was by the LER
which had consolidated all the Yerkes tubes by then.