Think logically. If the Citaros are meant to replace the MK3s,
they should be purchased back in 2008 and introduced into service
in 2009, but they only purchase it in 2010 and introduce it into
service in 2011. Look at the previous trend as well. Most of the
MK3s were replaced by MK4s and K230UBs, so SBS Transit seems to
have a special reason to buy the Citaros.
The KUBS replaced those MK3 that goes off early.Citaros replaced
the remaining MK3s
