I'm working on the blast furnace models for my layout (instead of painting the ceiling like I should be). I can't seem to find a good source on the depth of the runners on the casting floor where the iron flowed from the furnace to the torpedo cars. I'm leaning towards making it a foot deep right now. Anybody have any thoughts or info I missed on the internet? Photos make it look like I'm guessing close to the right depth.
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