123 might be the first to get them since SBS8057K and SBS8067G
are transferred out to SLBP. 
Well. For me, I think the Citaros will go to routes like 5, 66,
506 where there are WABs but not enough make it a
WAB route. So the Citaro will kick out the striders or DM3500 to
replace the MK3 in some routes. Then, once there is enough Citaro
to make it a WAB route, then the route will become WAB route.
