You know that is curious, but the trains in Ja are pretty glitchy as far as rotating is concerned. I tried to make one several times, but it would not rotate the proper way.
I worked in Radiant 1.3 and 1.5 and in the latter it is possible to state the parameter of rotation. But the train will not rotate as a tram in our world.
Well here is a picture of train movings. In radiant it makes 90 degrees rotation.