Make sure all objects have correct UV coordinates on them (channel 1 channel 2 and 3 when required for multi-pass materials). NURBS, patches and splines are not supported geometry types. Create Editable Mesh or Editable Poly objects only. Use dimensional data from scale drawings and do not place these objects by eye. Work accurately, especially when it comes to wheels (diameter/width), bogies (position) and placement of pivots, as well as the overall dimensions of the vehicle you are modelling. The side flanges extend beyond their quoted diameters and their size should be estimated from photographs. The driving surface of the wheels, where they touch the rails, should be precisely at ground level (Z = 0.0). Reset XForm if you have made any changes to pivots or scale. Their pivot should be at ground level (Z = 0.0) Bogies need to rotate around their Z-axis. Wheels need to rotate around their X-axis. 
Make sure this object is perfectly centred between the front and rear wheels or bogies.
Place the root node object (locomotive/coach/wagon/etc.) at 0,0,0. In the top viewport the front of the vehicle should face up. The orientation of the train models is very important.Place pivots of movable or rotatable objects (wheels, bogies, doors) precisely at their correct physical pivots.All objects should have uniform 100% scaling on them.Rid your scene of non-relevant objects before export, or at least hide them.All objects should be collapsed to an Editable Mesh or Editable Poly.Always use lowercase for all filenames ( max, dds, ace, psd, etc.).
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