[GreenKeys] What the heck is a "Selector Key"?

[Sam Hallas]

Jeff Seidel wrote:
>  Here is some info on the selectors from my website
>  http://www.railroad-signaling.com/telephones/wetdts.html

Thanks, Jeff. Pity I didn't know about your site when I was writing this
page:
http://www.samhallas.co.uk/railway/stc_control.htm
I have a diagram from the catalogue of the selector key used on the
train dispatcher's system.

The dispatcher would have one of the cabinets illustrated from Paul
Wills collection with a selector key for each waystation.

It's interesting to hear that the system found uses in the teleprinter
business too. I must check out those patent numbers that Jim came up with.

Cheers,
Sam