I did this dusk shot in June of a passing coal train with the coal dust blowing across the field. This was with the 1.4 on a 5D Mark III.
Damn! I sure wouldn't want to be living downwind from the rail line! Most places on the planet legislate that coal must be drenched before being freighted in open rail-cars. But like smoke, smog, fog and dust storms, coal dust can be the photographers friend. Nice shot.