I would like to ask how large Siemens air compressors used in chemical plants, along with motors and expanders integrated into one unit, can be connected coaxially and in what manner

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I have a question regarding giant Siemens air compressors used in chemical plants. These compressors are equipped with a drive motor, and on the other side of the same axis as the motor, there is an expander. When the air compressor starts, it drives the turbine to compress air; at this time, the expander is not active, and the shafts of the motor and the expander are separated from each other. Once gas is introduced into the expander and it begins to rotate at a certain speed, will it connect to the main motor of the air compressor, thereby allowing the drive motor to save energy or even generate electricity? I’ve always been curious: such large-scale equipment has shafts as thick as a human’s arm, and the turbines are also extremely large. What type of connection is used for the motor shaft and the expander shaft, and how is it possible to connect and disconnect them in a way similar to a car’s clutch? , Thank you for your answer, expert :)