www.msts.fora.pl

[Gość]

does anyone know if theres a euronight service from warszawa to krakow via cmk line

[Preki]

There were no EuroNight services via Kraków as far as I know. The only EN trains as of now are Chopin from Warsaw via CMK route, Katowice, Zebrzydowice to Prague/Vienna/Budapest and Jan Kiepura as three to four through coaches attached to EuroCity Warsaw-Berlin. The latter was formely a stand-alone train and PKP Intercity's flagship upon its launch in 2004.

If you're asking about an activity for MSTS - sorry, there's none.