Telephone Networks (and alternate uses for them)

[Raellus]

It's an interesting concept, one that I haven't ever considered- because I didn't think the telegraph was in use in the 1990's (or '80's even). How realistic is it, though?

How extensive was the pre-2000 telegraph network? Who used it, how often, and what for?

Even if a widespread telegraph network existed c. 1997, or could be brought up and running after the TDM, it would still be very vulnerable to disruption. During the American Civil War, both sides routinely cut telegraph cables and/or cut down telegraph poles. All you need is an axe.