the third track is after the FP reuguler line come together you go right up the stares ( or if you are in a wheel chair up the ramp) the third trice you will go left at this point.I was there last week and never saw a third track. We went on using a fast pass. Does the third track grab people from the stand by line? It didn't look any different to me.

Noticeably shorter when we've been there. (February, September)
I do think that now if Rock n Roller Coaster and Midway Mania are both on your agenda, I'd be more inclined to Fastpass RnRC now. Over the past ten days we were just there, the wait times for RnRC were ALWAYS higher than Midway Mania. If you hit Midway Mania early or late, you'll fare better, obviously, in terms of a wait time.
The park just has so few options now, but TSMM seems more capable of handling the crowds now than RnRC (which surprises me, honestly).
I understand where it's at. I can't believe I didn't notice it. When did the third track open? We were there at Thanksgiving and a week ago. I think once we grab our glasses and get sent through we just run up the stairs excited. Where is the exit for the third track?
Right now there are still FP available today for TSMM but not RNRIs it possible to get a 4th FP for TSMM or RnR?
like other have said the wait times are shorter about 45 minutes ( give or take) but this has been the new norm so the wait seem long now, before it could be any where from 60-90+ minutes.
I just look at the wait times, from the Disney App, and they are confirming what you are saying. Its 12:47 WDW time on Monday and TSM is showing a wait time of 25mins versus RnR at 105min and ToT at 80 mins.