That's likely during peak hour so not so rare la.
In June i spotted 3 consecutive(and took 1) Sv151 together also at
Macpherson area due to the ignorance and stupidity of the BC of the
bus i took. It was SBS 1885 H. Afterwhich, SBS 27?? ? came and
another MK2 WA NAC came at about 8PM.
