It's still a Google Sketchup model(the conversion process is tricky, but can be done), and from the looks of it it looks like it has roughly 300+ polygons. I wouldn't use it, however, until the original author grants permission. If not, then it's squashed.
Half of the model is made out of PNG images which use alpha channels to make the trusses, railings, etc. transparent, so it would appear is if it is intricate object work, mostly like what we do here. But like Ray said, it still has too many polygons to ever generate positive results on most computers.
Still, it could be used as a basis for much more objects along the Northeast Corridor route.
BStyles