I haven't yet found a map directly but the old line has a museum and part still running, I'm fairly sure they'd know and Chattanooga was on their website.
I haven't been able to nail down the "Huntsville to Chattanooga" line, I did find a map showing the Tennessee railways.
It appears that the Southern (Now the Norfolk Southern) ran from Chattanooga and passed through Kingsport on its way to Bristol. It's an older map dated 1976.
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