railroad spikes with an "HC" stamped into the head typically contain anywhere from .40-.60% Carbon. Don't know about any of the other elements, so if it has an amazing heat treat I'm sure it'll cover just about anything you'll need.
There was also some talk about a yr ago on whether the railroads themselves were A2 or a 1080 variant.
Personally, I want any movie I see about a guy that travels back in time in a souped up DeLorean and meets his parents before they were married to have the appropriate guitar for the year, kinda blew the believability of the whole movie for me.
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