Originally Posted by YuropFlyer

Also, you don't really get landside on such a transfer. There is a dedicated shortcut in the main area of T3 (clearly marked as International transfer) which gets you to stay airside.

I'd say that, unless your incoming aircraft is more than 1hr delayed, you will make your connection (should there be a queue at immigration/security after the train ride, you might have to be loud to be let in front, if your departure time is closing in)

Now, I'd just relax. I guess your life doesn't depend on catching that flight