[GreenKeys] How were teletypes connected across long distances?

[Robert Nickels]

On 11/24/2023 11:27 AM, Sheldon Daitch wrote:
> Here is another link with some photos of the 25A equipment:

Ah, that's more what I was looking for, thanks!   Getting 25 data 
channels from a single voice circuit had to be pretty impressive at the 
time.

I see both of these documents were sent to the Milwaukee Road chief 
operator in Savanna IL, about 40 miles west of me. Railroads were 
obviously big customers.

73, Bob W9RAN