So, I finally did it. Finished game in two years (36 minutes), earned 63 points.
I utilized six big (1.6k-2.7k) cities in one corner of the map and just single city (1.6k) on other corner. Also, at the end I started to transfer wood, coal, goods and etc. to increase performance. But that was not enough for 80+ points.
Kyrre, you made a mistake in your assumption: to finish in two years you have 11 quarters instead of 7.