Re: Glenbrook..... What was said?

[dave pierson <pierson@mail.dec.com>]

Tony Gatt wrote:
 
> John MacCallum wrote:
 
> > Jack wrote:
> > Snip

> > > WL2 was ahead.... it seems reasonable to me that if you are informed there
> > > is a train ahead in an automatic area, you proceed past a stick at stop
> > > lookin very hard for that train that is ahead...

> > Yes if I was told to Pass an Automatic that was at Stop because
> > if had failed I would expect to find the next signal either at
> > stop or clear, not another train!
 
> John,  that is a worrying statement.....
 
> Think about the possibilities... a signal is declared defective by a signaller
> that has No track circuit identification of the area, just because it failed to
> clear..
 
> possibilities for failing to clear could include...
>     Broken track circuit bond.
>     Broken rail
>     Defective control gear
>     TRAIN IN SECTION..

> in any circumstance, permission to pass is given on the grounds that the driver
> would proceed at a speed of which he could stop short of any obstruction.

	A bunch of people died in Boston, MA, USA that way.  Subway, ATS
	fitted.  ATS arm failed up (stop).  Assigned person to manually
	depress & instruct trains by.  After some hours, confusion set in
	& someone was given the go by without clear understanding that a
	train _was_ ahead...

-- 
thanks
dave pierson			|the facts, as accurately as i can manage,
Smart Modular Technology  	|the opinions, my own.
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