According to SGWiki,
Buses:
SBS2676M SBS2778C
2 Volvo B10M Mark IV (1 Strider / 1 DM3500)
SBS3017J SBS3018G
2 Volvo B9TL (2 WEG2 Batch 2B)
SBS9217J SBS9219D SBS9283S SBS9434Z SBS9461U SBS9465J
SBS9468B SBS9469Z SBS9605Y SBS9606U SBS9607S SBS9628G
SBS9665Z
13 Volvo Olympian 3-Axle (3 Batch 1 / 5 Batch 2 / 5 Batch
3)
SBS9889U
1 Volvo B10TL (1 CDGE)
SBS2799S
1 Volvo B10M Mark IV (1 DM3500)
SBS5062P SBS8853D
2 Scania K230UB (1 Batch 1 Euro V / 1 Batch 2 Euro V)
SBS9033Y SBS9153J
2 Leyland Olympian 3-Axle
SBS9425A SBS9642P
2 Volvo Olympian 3-Axle (1 Batch 2 / 1 Batch 3)
Total WAB: 4/25
Soon: 6/25 due to Leyland Olympians
Service 166
does not have 4 WABs everyday.It has 4-8.Others are cameo wrights
or CDGE from Clementi Temporary Interchange or
BBDEP.
I believe if
the technology is smart enough,they can convert SBS9889U into WAB
as they are ordered around the date they ordered the CDGEs.The
CDGEs were ordered on 28 December 2004.
What Clementi Temporary Interchange?