Post by NYI've always wondered why the up and down platforms of the Moorgate line (the
Hotel Curve platform and the York Road platform) were on opposite sides of
the main station, with separate single-track tunnels rather than one
twin-track tunnel. Was the line originally built as a single track with a
bidirectional platform and later expanded to a second tunnel and platform,
maybe with a gentler curve on the newer tunnel? Or was it built as two
narrow tunnels and two platforms right from the start?
If you see the 1874 map I linked to, you can see the separate tunnels. The
Widened Lines fully opened in 1866, so it seems unlikely that the separate
tunnels were a plan B - according to Wikipedia they opened in 1863.
In common with early practice, King's Cross had separate arrival and
departure platforms - the current 1 and 8 respectively. It therefore made
sense for up trains to turn left away from platform 1 into York Road, and
for down trains from the Widened Lines to join north of platform 8 on the
Hotel Curve.
With these split arrangements, you might think the Hotel Curve would have
been grade separated to avoid conflicting with the eastbound Widened Line,
but it seems not. However it /did/ avoid conflicting movements with the KX
throat, possibly more important.
Loading Image...is the Widened Lines track diagram.
It's rather ironic to note that, after ripping up these tracks 40 years ago,
we've just put them back in the form of the Canal Tunnels.
(anyone know what the original 1991 Thameslink 2000 plan did here?)
Theo