I don't think 6 car 380s are allowed to Neilston due to the length of the turnback, and Infact they're rarely used on the Circle at all, minus events at Hampden.
I wasn't intending to suggest 6-car 380 formations should be used, that was just a note on how the 318/320s seat more really.
But looking at how the existing fleet can be re-jigged it seems probable that EK will get 380s as per Barrhead but as noted above some peak extras may remain 156(?). Then presumably the easiest way to obtain these 380s, assuming no slack exists is to take them from Cathcart/Neilston and give those routes 318/320s instead.
Either that or Wemyss Bay/Gourock see less 380/385 and get the 318/320s.
This does assume there are no spare 380s that can just be used off the bat no issue, but ISTR the unit for Barrhead was only available because of the cuts in Ayrshire. Many services under the reduced Fit for the Future timetable were already extended, such as Ardrossan and Largs running some 7s off-peak and Wemyss Bay getting 4s and 6s where previously when Gourock and Ayr had 4tph, 2 of those picking up the lesser calls, most off-peak services seemed to always be single 3s or 4s with just the traditional shoulder peak/peak strengthening.
Unless someone can advise whether there are presently sufficient free 380 units for EK as it stands?