Or addon ?

[bandorr2000]

Several routes I get this error message : Information: Ignored missing overheadwire.ace, using default. You can copy the overheadwire.ace from OR's AddOns folder

Where is this addon?

[oper190]

Don't know about an add-on, but my overheadwire.ace is in some routes and are located in the route textures folder , but not all. I'd suspect the default is the one in the Global Texture folder. It is a plan color texture so any one color .ace you like could be copied as that file. My default had been white, but I changed it.

Edit - I just checked my folders and my MSTS back-up. There never was an overheadwire.ace in MSTS, so you just need to make one. Copy any single color .ace you like and copy and rename it as overheadwire.ace ( or make your own ) and place it in your Goble Texture folder and you should be good to go. Can copy it into the Route Texture folder too to avoid error messages. I suspect my original "white" wires were the shape without a texture.

[geepster775]

Look in the Documentation/SampleFiles/Manual folder for the overheadwire texture. That needs to be unzipped and placed in either the routes or global textures folder. Or uncheck the options if no routes in the installation are remotely electrified.

[bandorr2000]

Apparently this was a feature in very early OR development. The folder can be found here :
White overhead wires - Elvas Tower

[oper190]

Look in the Documentation/SampleFiles/Manual folder for the overheadwire texture.

That's where it is in my install of v1.4. Didn't know that, so made my own .ace and by chance picked a color every close to theirs.