this post was submitted on 25 Sep 2024
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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. ๐