LUL▸ have a system for air conditioning tube trains (i.e the ones in the small dia, deep tunnels).
The compressors will be off in the tunnels, so no condenser heat will be emitted.
The appliance of Science,
OTC
I think you are talking about an idea that has been proposed. It doesn't exist yet, and until it is specified for a new fleet, it remains theoretical...
Paul
It has been tested and proven, so it's certainly not theoretical.
You are absolutely right to point out that the new stock (and its specification) doesn't exist yet.
OTC