no no ,thr s no mainline platform at avadi as of now for 22639 for looping it must cross the 4th main track and join final platform no:4 which will take atleast 10 mins bro,22640 avd,per is always there so leave that,22639 avadi will be useful but will surely end up 20 mins late atleast at ajj,coz no main track platform,train has to loop to main track 4 and then to final platform no:4 loop track,so it will take time,instead trl for 22639 is good as it arrive main line main track platform and depart with 1 min stop,hope u undertsand,its tough to loop in avadi train must get slow from annanur to avadi bridge,,instaed of giving 1 hr 15 min in mas ajj section,if its trl the train can make mas ajj section in 50 to 55 mins itself with a stop