The question a bit vague...
I dunno if my answer is correct or not...
I dun remember seeing any OC or Citaro on Svc 178, 856, 960,
962, 964, 966 or even the Woodlands Feeder/Intratown (900/900A,
901, 902, 903, 904, 911, 912, 913)
Citaro no. 128B,134H perm 911 2E perm 178 966 just got an OC cameo
25P 904 dont have OC because the bus was introduced when the OC
left WLDEP All other svc except 902 have OC cameo. Citaro WLDEP
time mainly clustered to 75 n 961. But Citaro nowadays will appear
on 856 and 966