The difference between Finnish and Russian gauge is 4mm
IIRC the diff to European standard is closer to 10cm, still doable but a hurdle compared to just driving a trainload of troops to the middle of Helsinki it's a bit harder
IIRC the diff to European standard is closer to 10cm, still doable but a hurdle compared to just driving a trainload of troops to the middle of Helsinki it's a bit harder
1524 - 1435 = 89
https://en.wikipedia.org/wiki/5_ft_and_1520_mm_gauge_railway...
Clearly not "doable", without guage changing bogies.
https://en.wikipedia.org/wiki/Torne_River_Railway_Bridge#/me...
Even if you were to 4-rail every line, you'd potentially run into loading gauge issues (you would have to offset the current centre of the bogies, go too far one way and you collide with platforms, too far the other way and you collide with oncoming trains)
As for the loading gauge, yes, of course. On the plus side, this is Finland, most of the lines is in the middle of nowhere and single track even. Maybe the best option for them is to just build 1435 in parallel whereever possible, and just merge where not otherwise practical (bridges, tunnels, populated areas & stations). I don't even think it's that infeasible considering Finland's layout. I'd wager there are only a handful of specific locations that need expensive work.
> The difference between Finnish and Russian gauge is 4mm
Yes they are. Of course practical tolerances including allowances for wear and there are large enough that things can be made to work, but in terms of nominal construction tolerances for example, 4 mm can easily eat up all your construction tolerances or even exceed them.