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To be safe, a coat of wax or paint sealant should be applied to the paint for protection.
Never use clay to remove rail dust because all that does is break off the tip of the metal particle, leaving a part of the metal still on/in the paint and when it rusts the spots will come back. If a paint finish offended with rail dust is properly treated chemically, then that should solve the problem.
Read also: Leather and vinyl repairs that last
You certainly do not want to repaint a vehicle unless you are absolutely certain there is no rail dust residue on the car. Of course, a competent paint shop would insure this to be the case before repainting.
If a detail shop, auto dealer or body shop attempted to remove the rail dust and it comes back, it is a good assumption that they do not know know what they are doing, or implemented the incorrect process.