Supplementary note by London Underground
Limited (OPT 18A)
REINSTATEMENT OF WINDOWS IN TUBE CARRIAGES
Thank you for your letter of 30 January 2003,
concerning this matter. Our older Tube cars are currently fitted
with vents above the fixed windows which can be opened or shut
by passengers. When open, air is forced through the vents into
the cars by the movement of the train through the tunnel. When
the train is stationary, there is virtually no ventilating effect
through the vents. So when a train becomes stuck in a tunnel,
for whatever reason, ventilation effects through the vents are
minimal. The same would be the case if windows were to be fitted
instead of the vents.
On our newer train fleets, on the Central, Jubilee,
Northern and Waterloo & City Lines, the cars are fitted with
fan assisted forced air ventilation which work even if the train
becomes stuck. All future new trains, provided as part of PPP
will be to a similar standard.
Unfortunately, it is neither physically nor
economically practicable to retro-fit forced air ventilation to
our older train fleets.
I trust this provides the information the Committee
11 February 2003