I find it abit inappropriate to label one portion of the route
as the "E" route and the other as the portion without.
The suffix "E" is
not exclusive to any portion/loop of the route. It
so happens that TIBS/SMRTB decided to make buses end their trips
with the western loops most of the time.
You were either too young or not a frequent traveller or resident
commuting on the intratown services since the time of TIBS when
both east and
west loops for 911, 912 and 913 had terminating trips, or "E"
trips. Such is a very common practice to maintain
frequencies on the eastern loops while the western loops experience
delays and such due to the infamous Woodlands checkpoint
jams.
Nowadays with the checkpoint traffic diverted away from the
Woodlands Centre Road somewhat, such massive traffic jams are
getting less common but they still take place. And thus such
practices of having "E" trips on the east loops still remain, but
sre limited to only a few trips as they now have in place
contingency plans where buses change services at the junctions of
Woodlands Centre Road/Marsiling Road and Centre Road/Admiralty Road
to avoid the jammed up area altogether.
As such, there is no such thing as "one of them being the E route and the other
is the one without E".
