All the train models are powered by the physical simulation of MMD.
You can play with MMD using these train models.
How to load a model from MMD.
Download a zip file from the next url. bowlroll.net/up/dl2707
A file is downloadable if you click the big red button on left side.
Extract a zip file to C:/ directly under.
A MMD folder is created.
Search *.pmm in a MMD folder and load to MMD.
Chose MMD Menu to move. 'physical operation' - 'anytime'