is 100% score possible?

Timetable is full of collisions. Huonoa. Toivottavasti Suomen rautatiet ovat paljoa parempaa.

I'm not sure if the closed plattforms are ment to be closed for stopping trains or if the track is meant to be closed completely. I suggest you either disconnect the track or delete the platform to make clear how it's meant to be played.

With a total closure that gives some brainwork to players - I like!