Re: (aus) Real Time Passenger Counting Trains ??

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

D&M wrote:

> Hello all
>
> I was listening to some rail staff, and they mentioned suburban trains that
> could tell how many people are on them, Something to do with the weight of
> the train. I heard it has something to do with the secondry air suspension.
> Has anyone heard of such trains in oz or are they only overseas?.
>
> If anyone could point me to some info I would appreciate it.

As more people join the train, the pressure in the air suspension increases.
This also increases, via the load compensating valves, the air flowing into the
Electro-Pneumatic brakes.  So, an empty train in full service EP would get about
200kPA in the brake cylinders, while a fully loaded train would get about
250kPA.


--
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.