You made a good point on SL, but they haven't reduced any AC coaches for accommodating SL. Previously, it used to run with 17 coaches. Now, it is running with 22 after adding 3SL and 2GS. Regarding 3E, it is due to RSA for cocanada and SPL train. SPL used to run with 10 3E coaches, so 5 were transferred to cocanada and 5 3A were transferred from cocanada to SPL.