Yes bro. The tracks from bridge gets down in parallel to Jolerapettai to chennai route by big curve and can joins with 2,3,4,5 platform of katpadi. If you see the Google satellite view may be you can easily understand.
Villupuram to renigunta via Walajah is 2&3
Villupuram to renigunta via Tirupati is 3,4,5.
Jolerapettai to renigunta via Walajah Is 2&3.
Jolerapettai...
more... to renigunta via Tirupati is 3,4,5.