Not sure what u are driving at but JIS has mostly B9TL Batch 3s and
4s. And SLBP has the highest number of Batch 3s. Days of mass VO2x
and LO3x are over. It's a new generation now.
The days of mass LO2X, VO2X, LO3X and VO3X (Batch 1 & 2) are
over. Volvo B9TLs progressively introduced after extending the
remaining 25 buses permanently to 249, 251, 252, 254, 255, 257.
2003: LO2X withdrawn, VO2X took over.
2006: LO3X took from several services after being replaced by
B9TL (CDGE).
2007: VO3X also took the early batches for JIS 257
2011: Mass withdrawal of VO2X from JIS and replaced by LO3X and
VO3X.
2012: Mass withdrawal of LO3X from JIS and replaced by VO3X.
2013: Mass withdrawal of VO3X (Batch 1) from JIS and replaced by
later batches.
2014: Volvo B9TLs began to be progressively introduced.
2016: JIS became WAB. VO3X (Batch 2) began to be withdrawn.
Some Batch 3s were extended but they did not use so much.
(Note: The VO3X Batch 3, SBS9670H will be the last non-WAB bus
to be de-registered)