Were there any telegraph lines available in late 19th century Russia (let's say year 1875), which would go deep into mainland Russia?
I can find some mentions about Moscow telegraph station being created in 1852 and then extended few times around 1870. I cannot find any specific reports of the lines going between the cities, but I suppose there is a good chance they would follow main railroad routes, especially to St Petersburg (back then capital of Russia).
What I'm really interested in are any connections going the other direction - east of Moscow.
There was a failed attempt to create America->Moscow telegraph line in 1860's, but it stopped well before reaching mainland Russia.
So, in 1875, was there any possibility of sending a message from Moscow or St Petersburg, to Tomsk, for example, faster than utilizing snail mail?