How might I overcome settling air in a superdeep tunnel?

So, in this scenario, people are living in an Earth-sized planet, with an atmosphere. They travel via ultrafast train that carries them to the solid core of the planet, where they then transfer to other lines that take them back to the surface. However, an issue is that in the deeper parts of the tunnel, air gets denser and denser as there's more air pushing down, and I'd prefer to not have hundreds of airlocks. How else might I simply solve this?

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How might I overcome settling air in a superdeep tunnel?

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