I have question about cells library. Maybe, somobody know when can I find and download library with rail elements? I'm especially intrested of this element in 3D:
Looks non US based. What country is this for? I would personally contact the manufacturer.
Most cell libraries are user/entity generated and most in the US are cross sectional and not 3D.
If you can get manufacturer drawings of the fastener system, you can create a 3D cell in Microstation.
Also, we have OpenRail data sets for a few countries, the cell libraries included in these data sets might have the 3D fasteners you're looking for.
Filter the results for "data set" under the Deliverable Type category: