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Stupid question for subway riders

Can anyone tell me why subways everywhere seem to air-condition the trains instead of the stations/tunnels?
The heat dumped from the A/C on trains makes the stations intolerable in Summer. It would seem far more efficient to take the naturally cooler, underground tunnels & stations and augment them with air conditioning and just have the trains themselves draw the chilled outside air.
Am I missing something?

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In reply to: Stupid question for subway riders

if they had a way to seal up the tunnels as the size would be so big and hard to do

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In either even, you're dealing with

In reply to: Stupid question for subway riders

an enclosed space. The heat is being generated primarily by energy use and human bodies. In northern climates this heat becomes more useful in winter. Whether the AC is in the trains or in the external environment probably makes little difference. It might be possible to build a huge device that acts like a heat pump and conditions the tunnel system. That would have to cost plenty. As well, remember that the bad stuff that comes out of the tunnels in any season is fed into the city air. So, heat from the tunnels channeled into the city in summer would mean additional AC need for buildings....creating additional outside heat....creating additional AC need for...... Can you see the cascade coming. Happy

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some systems are probably too old

In reply to: In either even, you're dealing with

built before a/c existed. rehab probably too expensive. I remember when you could open the windows on the chicago system. then you had heat, wind and noise. be glad that it was added to the cars and has become more reliable.

I might be wrong but isn't the DC station system a/c?

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(NT) stupid me--my reply was to punterjoe--wakeup w-h

In reply to: some systems are probably too old

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The NYC subway system has nearly 700 miles of tunnels

In reply to: Stupid question for subway riders

You think taxes there are high now? Imagine having to foot the electric bill to air condition 700 miles of tunnels.

The system is ventilated in such a way that if they could do it, the hot air would be forced upwards into the street. Nice idea but I really doubt it's practical or possible.

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