sbs's wldep used to control services that run in woodlands and
probably cck and/or bt panjang back then.
when sbs gave woodlands to tibs in the 80s, wldep closed
down.
bbdep was there all along to serve jurong east, bt batok, cck, bt
panjang services.
hgdep built many stuff over the past 12 years. they include the mk4
striders, the batch 2 and 3 VOs and also the mk4 DM3500s
