One of my first horse rides as a child made me pretty much swear off ever getting on one again. Stable it was not...
I hever never once heard of a dutch roll occuring to a train.
Am on a Dutch train right now and there is a distinct lack of roll, Dutch or otherwise.
That said, I wonder where the term Dutch Roll comes from. Perhaps the oscillation is reminiscent of the motion of a ship rocking side to side. The Dutch were a major sea power.
When it happens, it's catastrophic, and then it is not called a dutch roll.