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Whats a 'guard's indicator'?

Subject: Whats a 'guard's indicator'?
From: "Jonathan Boles" <mousewithglasses@NO.CANNED.HAM.hotmail.com>
Date: Wed, 09 Feb 2000 10:11:50 GMT
Newsgroups: aus.rail
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)

What is one of these things? (a single light hanging above the platform
with the words "GUARDS INDICATOR" below)

Follow-Ups:
- Re: Whats a 'guard's indicator'?
  - From: "Peter Kilburn" <juneejct@mpx.com.au>
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  - From: "Dave Proctor" <thadocta@spambait.dingoblue.net.au>
- Re: Whats a 'guard's indicator'?
  - From: "Hubert Lam" <hubert@imap4.com>

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