https://www.scmp.com/news/china/science/article/3255351/nasas-dream-comes-true-china-plans-build-giant-rail-gun-launch-hypersonic-planes-space
https://www.scmp.com/news/china/science/article/3255351/nasas-dream-comes-true-china-plans-build-giant-rail-gun-launch-hypersonic-planes-space
What you said, but the orbits are elliptical. The periapsis (lowest orbital altitude) would be the point where the craft exits the rail launch - located within earth's atmosphere.
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