[GreenKeys] Open wire lines

[Sam Hallas]

TELEGRAPHER at att.net wrote:
>Most all the telephones
>  were replaced or rewired because they had the "tube" ringer circuits
>  in them. Learned a lot on those projects.

Larry, thanks for sharing your reminiscences.

I'm curious about what you called the 'tube' ringer circuits. Would that 
have been anything like the cold-cathode selective omnibus circuit used 
for a time on British Railways Southern Region? As described at:
http://www.samhallas.co.uk/railway/auto_party.htm

Cheers,
Sam