Ventilation still a problem with just electric trains with metal rolling stock?
I could be off, but I seem to remember that the requirements for ventilation are less if there is no combustion engine + exhaust fumes present. I’ll see if if I can dig up the actual design standards.
Also I wonder how does the train movement affect ventilation. I recall the mountain train tunnels in Italy. Since the tunnels are just wide enough, the trains act as pistons, pushing and pulling air in and out of the tunnels. I recall experiencing pretty strong wind coming out of the tunnel prior to the train emerging out of it. I wonder if this is enough to circulate enough air. I’m not expecting an answer, just wanted to share this shower thought. 😄
It is an issue, but an ICE burns far more fuel than a human. (food is fuel that the body burns!) That means if your have ICE engines in a tunnel you need a lot more air to get rid of the CO2 (ideally no other pollutants - though I wouldn’t bet on this) and get enough O2 there for everything to burn. If we only run electric trains we still need some air for the people to breath, but much less as they are breathing much less
