This one has been brewing for a while ever since I saw the film Western Union on TV a few weeks ago.
With electric telegraph having been mentioned in Legends and a Seacat post confirming it was 'wired' I think tis possible for a campaign to revolve around the construction of a telegraph line, the PCs would be adventurers hired to scout possible routes, act as troubleshooters and provide security. Theres plenty of scope for encounters from sabotages to outright attacks in the wilderness, as well as investigating missing work crews.
Now the basic idea I have is a telegraph line is to be built from Caspia to the Ordic capital of Merin to improve communications between the two kingdoms. This line will be known as the Grand Trunk once it is completed and would be the backbone of Cygnar's growing telegraph network. Rough idea of a route I have planned as follows;
Point Bourne (Optional, may get changed following the events of Wrath)
Caspia to Orven would probably be one of the easiest parts to do considering the railway line, crossing the moutains from Orven to Fort Whiterock would be the most changeling stretch. North of Fort Whiterock I'll give the PCs a choice whether to go to Point Bourne as originally planned, go with Plan B (build an outpost that'll serve as a junction) or come up with their own idea. At this point there will be plenty of trouble relating to the war in the form of Khadoran and Cryxian raids, Tarna will offer some false hope since they won't be in the clear until they're past Heartstone.
Reasons for a 'central' route through Orven would mean the route would be largely 'safe' since it'll be a harder target for anyone to attack being so deep in Cygnaran territory (in theory anyway). There is also the scope of further adventures building other routes.