Dubai Metro is driverless. So is the one in Toulouse. There are probably more, but those I have used myself.
They are Metros not mainline railways.
They have identical trains at low speeds on routes with few junctions, and, have reserved infrastructure from non automatic trains. ie few variables to account for in programming.
There are no main line automatic rail services. The worlds first automatic metro is nudging 50 years old and yet the technology has still not been applied to real main line railways.