I have made this trip on the very same train the day before the tragedy and was shocked when friends started checking if I'm OK.
Anyway, I don't think you should worry. Such accidents don't happen very often (it's the worst train accident in Czech in last 20 years).
Small update. Seems that České dráhy has successfully cleared the route and the trains are back on the usual route with small delays only. I will let you know tomorrow, as soon as I will be back in Kraków (from Prague).
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