If you need just a scenery object, albeit one with a higher number of necessary polygons, you can simply remove the bogies, enginespec, enginesound, and hornsound tags, and change the category and class to a scenery object. You will then have to do that with a set of bogies and then assemble the scenery object in place. I did that with the Peter Witt trolley car and some older rolling stock I wanted for a train museum.
John