This document covers the evolution of the Navy’s teletype network during WW2. 
https://www.navy-radio.com/manuals/ntx/NTX-story.pdf

A combination of wireline and radio. 

One thing I found interesting was that early on, relayed messages evidently had to be printed and then typed in again. Then, of course, they moved to paper tape relay. 

Nick K4NYW 

On Fri, Nov 24, 2023 at 9:20 PM Dave Horsfall <dave@horsfall.org> wrote:
On Fri, 24 Nov 2023, Chuck Robertson wrote:

> Probably dumb question:

There is no such thing as a dumb question; only dumb answers :-)

> If they didn’t have modems or routers, and the machines send and receive
> only by 110v current, does that mean there were dedicated wires across
> long distances between cities, carrying electrical pulses between
> sending machines and receiving machines?

Isn't the "R" in RTTY "radio"?

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