[GreenKeys] I bought one like this on ebay

[Sam Hallas]

Paul Wills (CKT&T) wrote:
> It's part of a Western Electric selective calling system generally used 
> by railroads but also found in other places.
> The one in the picture is interesting in that it has four additional 
> contacts that can be selected.

Paul modestly fails to mention the extensive display on his web site at:
<http://www.cedarknolltelephone.com/cedartel/index.htm>

The system was widely used on British Railways for line controllers 
(Dispatchers in the US). With help from Paul  I put together a page 
about it:
<http://www.samhallas.co.uk/railway/stc_control.htm>

Sam Hallas, G8EXV

-- 
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus