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Yes, the fence will run along the top of that wall. Galvanized steel .... hmm, paint it silver?
Galvanized steel is more like dull gray. I guess maybe gray primer color with maybe some silver mixed in. Go to a hardware store and check the color of galvanized nails. Guardrails are also usually galvanized, so you can chek those for color.
Rustoleum makes a true galvanized paint for repairing fences and the like. I use it all the time, like on my layout swingset. I decanted some too into a clean tamiya paint bottle for brush on use, but the spray bomb works good.
If you are still running any coal-fired steam, the track side of that wall will likely need a coat of soot. Even diesels or oil burning steam will leave a wall that close to the tracks with a fair amount of dark weathering. So any minor inaccuracy in paint color will be easy to hide.