This couple that was in the same train as me, left their seats to change the diaper of their little baby.
Not only did they go away from their luggage, but they left two phones and a large tablet visible and unattended for quite some time!
There are trustworthy and untrustworthy places in every country. If your train is safe, you're lucky to be there. If it's a couple of drunk idiots that fell asleep in the bathroom, do them a favor and watch their stuff until they wake up.