Re: [NSW] Tangara braking - was: Today (Sat) on 22 plat. Central

[David Johnson <trainman@ozemail.com.au>]

Tezza wrote:

> "David Johnson"
>
> > As Tezza said, emergency is more effective down to about 70 - 80 km/h, but
> then
> > regen is much better.
>
> Actually I was saying that regen below 72KMH, is more effective than regen
> above 72KMH. At whatever speed I still think it's more effective than
> emergency.
>
>   Also, you need to empty the brake pipe, which takes time
> > - Electric brakes are quicker.  The maximum braking effort is acheived by:
> > 1) Turn wheelslip circuit breakers off
> > 2) Full service EP application, plus slide the brake handle slightly into
> > emergency (not too far) and reduce the brake pipe to about 300 kpa, then
> return
> > the handle to the lap position to hold the brake pipe.  This gives 300 kpa
> in
> > the brake cylinders, and full regen brake.
> > 3) Put Parking Brake on.
>
> I don't think this has any effect, as the parking brake only goes on lightly
> if the EP is applied.

It will help in the last few km/h.  If you don't turn the wheelslip C/B off,
when you get to about 5 km/h, the wheelslip protection releases all brakes on
the train (Even though you have 300 kpa to the B.C.s).   The train can then roll
on for another half to full car length at 5 km/h before the brakes reapply.  If
the Parking Brake is on, the wheelslip protection cannot fully release your
brakes.  It could mean the difference between a fatality or not.

--
David Johnson
trainman@ozemail.com.au
http://www.ozemail.com.au/~trainman/
------------------------------------
These comments are made in a private
capacity and do not represent the
official view of State Rail.
C.O.W.S. Page 11.