Firstly, its not because of lousy acceleration.In fact, the
Service 89 MK3s have one of the best acceleration speeds around.
Simply because most of them are doing Service 89e as well during
peak hours. Most of them can speed faster along the TPE stretch and
Sengkang portion better than their counterparts on other services
that utilises that stretch (eg. Service 109 Mk3s).
Secondly, since Service 89/89e has a huge number of Mk3s around,
likewise for Service 34 last time, it makes sense to use these Mk3s
first to replace the Mk2s that are retiring, rather than dumping
the SP Mk4s onto the HG-controlled feeders which are flooded with
retiring Mk2s right?
Think about what buses would be used to replace the Scania N113CRBs
when the Scania N113CRBs in BNDEP are retiring, and you would get
the idea.
