Add on 688, 788, 888, 1688, 2688, 8388, 8888, 9288, 9688 which r
oso HG. 9888 moved to BR when 154 became SL/BR control.
Last time 1888 (MKII) was oso a HG bus but dereg already.

SBS1688K and SBS8388E both perm HGDEP 163 
SBS888G perm HGDEP 11, nice combination 
I remember SBS9888Y was the 1st low floor superbus that was
introduced in 1999, with the ribbon cutting ceremony lead by Mr Lim
Swee Say, Minister of State for Communications and IT. The bus was
deployed on HGDEP 87 during its beginning days.