Tom Anderson wrote:
On Fri, 24 Jul 2009, Peter Masson wrote:

"D7666" wrote

There is a substantial uplift in heating effect from the new trains.
Unless my sums are seriously flawed, there'd have to be some
seriously hefty cooling gear to cool stations. Gear that itself draws
power ... maybe more than the entire train regenerated power is taken
up by air- con ?

Add to that the congestion relief works at Victoria and the more
frequent service, there'll be more passengers pumping kilowatts into
the system.

Perhaps the Victoria Line needs to be extended into the open air, at
least so the piston effect of trains can add ventilation into the
tunnels, and ideally so that the next generation (49 stock) can have
aircon that takes heat out of the system and dumps it in the open air.

How about putting in some crossovers at Finsbury Park and running some
trains from Cockfosters into the Vic core? It's probably too far from
the Picc portal to Finsbury Park for this to really help.

Could you get a piston effect with some more ventilation shafts with
valves attached? Shafts would come in pairs, with a one-way valve on
each, so passing trains would push up one and suck it down the other.
Integrate some of the shafts with the Lea and New River for
water-cooling of the incoming air.

tom


Different signalling and train-operating systems between the two lines
would make that difficult.