Actually there is a way to reverse the routes yourself! When you
are in the game, press ESC, go to "Jump To Station", click "HL1
Harbourvale" and then wait for it to load. After that, when you
reach the station, press the + sign on your keypad(if you are using
C151 or C651. C751B is Enter) and close the doors. Set from F to N
then to B. From N to P1, 2, 3 or 4. Then continue until Blackton
Junction. But beware, no announcements are included if you do
this.
Yeah, but this normally works only for one-track routes. The
Harbourvale Line is a metro route which means that twin-tracks are
used, just like Singapore. Currently the HL16 to HL1 route drives
on the NB track, so when you manually drive the route backwards,
you are driving on the NB track, which is not correct. Plus, there
is a computer train 5 minutes behind and in front of you, so avoid
doing anything funny. :P