Alternative Space Transport Method Ideas.

I had another thought, instead of an internal ring of explosives, have a ring of nozzles with external standarized cartridges. They coud even be in continuous spirals.

This should make service and reloading cheaper and easier.

That's a good thought if the tunnel was above surface all the time. To make the tunnel level it will have to be buried under ground.

Build a service tunnel around it at the firing points. They will be quite a distance apart.

Otherwwise to reload it you would have to drive 1500 miles up the tunnel.

Yes, you have similarities to what I had envisioned and some aspect advantages. There will be around 150 vertical tunnels connecting the main tunnel. Also there will be storage facilities, located underground, connecting the main tunnel. This tunnel cannot be justified just for space exploration it will to have transport capability for cargo and humans between some industrious regions or perhaps two countries. The mag trains will have to share the tunnel and they will have to fit side by side to pass each other when going in opposite directions. The trains will retract into the storage facilities when the launch will take place.
Also, it's just a vision and all don't have to be exactly as I prescribe. Your suggestion for example could provide uninterrupted transportation during reloading of the charges, which could take up to a month. Then all the non-space transport vehicles will hide out for just an hour inside the storage facilities. The propellant smoke will be evacuated to make vacuum and the non-space transport will resume.