May be you are not aware. These two trains come to CGL daily for parking. Rather than just wasting power, this will help railway get atleast few cash.
Its not MS CGL commuters. They won't take it, as this will have express fare. But Many people get down at MS and take EMU to Mambalam/Tambaram/Paranur. It will benefit them. Not just entire train. At least 15 to 20% of current traveller will be using this train.
Rather than running empty till CGL daily, these will help railway getting atleast few penny.