Dun really know which topic to post so i post it here:
With Effect From 4th April 2010:
Service 172 will add 1 A/P and 2 'S' Shift,
6 A/P 
7 A/P
7 'S' shift 9 'S'
shift**
A total fleet of 13 buses 16 buses
**Not sure for S Shift they got add S2 Duties anot, Will Check
it out.
Current S shift is 172S101 to 172S107
Same date WEF: All 'S' shift 172 BC will rotate duty instead of
Perm S shift slot.
For thos who want to catch TIB 838H before 4th April, Its
on 172S107 slot. i take it everyday. Timing please PM me for more
details
