OK, here’s my attempt to answer your question. Paint fading occur as a permanent phenomenon from sunlight exposure, while weathering usually applies to the rust, dust, dirt, soot, grime, salt, flour, concrete residues, etc. that build up on a freight car. Most of those except rust will wash off, while rust and paint fade are there until the next paint job.
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> On Behalf Of Ted Larson via groups.io
Sent: Friday, September 16, 2022 7:40 AM
Subject: Re: [RealSTMFC] SFRD
Is there a difference between weathering and fading?
I thought fading was due to weather.