Let me clarify the PURPOSE of JE feeders.
333 - Toh Guan to Jurong East Avenue 1 link, JE St 32 link, JE to
Toh Guan (though this looks hopeless, outrun by 52, 105 and
183)
334 - general JE Feeder from JE Int to JE Avenue 1/JW Avenue 1. The
loading is too high. Especially evening peak. Maybe 2 S Shift buses
can do extra 1 round of 334 before calling it a day (for weekdays).
(follow 2994U)
335 - JE feeder to JW St 41/51/52. It should be quicker for the JW
Avenue 1 stretch. This feeder is manageable. Maybe an extra bus
will suffice.
Now, assisting services:
333: 52, 105, 183 all help 333 out. No wonder 333's load is very
poor.
334: 98. Sadly, even that service isn't coping very nicely with the
loads. Already from JE Int a SD becomes FULL.
335: JE/JW Avenue 1 will be 98. All other sections it's the sole
runner.