The first part of the route today is Kraków Glowny 🇵🇱 to Ostrava 🇨🇿
Here's the route, thanks to Open Railway Map - line speeds shown!
Leaving Kraków north westbound on the mainline towards Katowice - renovations almost done here, but the speed is still just vMax 120 (confirmed with my GPS!) but I assume will be increased soon
West through Zabierzów
At Trzebina, branch south towards Chrzanów - this is not the route the regular EuroCity to Ostrava takes
The line is being upgraded right now, and at the moment the line speed here is not more than 50 km/h