On my first visit to Velachery after the launch of the MRTS service (to get a full network season ticket from Velachery to Tambaram via beach, cost Rs. 195), I found many interesting aspects about one of the lesser known elevated urban railways in the world.
But first, here is the time table giving departures from Velachery. It is a mobile phone photograph converted into PDF for ease of download: velacherytimings.pdf
More on the trip, a video and some photos later.