Removing the air (vacuum) is a good solution for super sonic speeds. But what about moving sea level density air through the tunnel at sub sonic speeds such as 100s of meters per second? That way you can ride through the tunnel at say 200 meters/sec (~450 mph) with the top down without having your hat blow off thanks to a constant strong tailwind going roughly same speed as the vehicle. No need for pressurized cabins!
The moving air would also help propel the vehicle forward a bit. A light vehicle with a sail could possibly be propelled solely by the wind! The air could also whisk away heat generated by the magnetic propulsion system.
Maybe the air system could be in a loop, more efficient than sucking it in and blowing it out to the atmosphere. Maintaining airspeed shouldn't be a problem, not much air resistance to overcome.
https://en.wikipedia.org/wiki/Pneumatic_tube
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