I don't think we've actually had any scheduled triple mids during the regular 5 day week in the last year or so (at least I haven't). At one point we had several RDO lines with a single person so for each of those, they pull someone from the next RDO line to be the 2nd person on the previous mid. If there are 2 people on that line they try to alternate it so you only do the double mid every other week, but if you're also on a one person line, or your partner is on leave, then you get a double mid like every week. And if other single line people have leave then that can turn into the triple mid. Also, a lot of our OT is mids, so if you had the double and then get scheduled or called OT, that's a triple mid too, which is different from the regular staffing MOU but that still results in triple mids. They tried to make the RDO lines as best as they could I suppose but with leave and stuff it became necessary sometimes.
Our current ATM is better at calling in OT so the triple isn't seen as much, and we have some more people checked out now so it's evened out, but the ability to schedule that way is still there. I'm pretty sure our current rep is planning on making some changes and will try to get rid of it when the time comes. I used to not mind it as much. Our mid is easy, usually very little traffic, and it's a day to not have to see mgmt or whatever. However, as I get older it's catching up to me more and I'm a lot more tired than in the past. Guys 10 years younger than me are feeling it too.