Trans-Siberian Highway @ 5200km
We turn right (West) onto the Trans-Siberian Highway or Asian Highway, this section of which was built by Gulag prisoners as recently as 1949.
https://en.wikipedia.org/wiki/Trans-Siberian_Highway
The Trans-Siberian Highway runs for 11,000km right through to St Petersburg
At this point, we are 20% through our overall journey & only 70km from the Chinese border.
You can see some photos / prints from the time the railway was built (1908-1913)
https://www.loc.gov/search/?in=&q=urusha&new=true&st=
And from a more recent traveller, travelling by rail:
https://www.polarsteps.com/NikolaiGoryntsev/2880304-transsiberian-railway/22451552-amazar