You seem to be confused between acceleration and escape velocity.

A Tesla Model S can accelerate at 1.14g while going from 0-60mph, but it can't continue that acceleration for long.

A dragster can accelerate at 5g for almost a second. It won't get into orbit if you send it off a ramp.

The train with a centripetal acceleration of 2g will not launch anything into orbit unless it can magically keep providing that acceleration to the vehicle.

On the other side, you don't need to accelerate particularly hard if you want escape velocity, you just need to get up to that speed after accounting for atmospheric drag. You could launch a winged rocket that accelerates at 1.12meters/s^2 -- in ten thousand seconds or so, it would be up to escape velocity.