On the timesheets, the duty code is stated as either se-xxx or
sw-xxx. se is for East district and sw is for west district.
Previously, they used depot codes, like jr-xxx for Jurong Depot
duties.
The first digit represents the type of bus used. It is explained
here by Oceane (it is a bit outdated): http://sgforums.com/forums/1279/topics/319708?page=42#post_8351716
Second and third digits is the run number, up till the late
1990s, the run number was displayed on the front of the buses which
were running on clowbus (jumpbus) services.
For example se-801 is run number 1 for the particular service
and is run by a single deck aircon bus.
The reason why you couldn't find it is because it has been a
very long time since anyone has asked about it (the post was in
2008), and also because sbs calls it run number and so did bus fans
back then.
I see, thanks for the info and research..
So is it possible say, for example a DD runs on sw-801? or will
it be called sw-301 instead?