There's an insane disconnect between this discussion about keeping nuclear explosion events, and the one about removing railways. The argument seems to come down to what was left over and if it's mappable. Well, the two are very similar:
* Nuclear explosions leave craters and radioactive isotopes. * Railways leave ballast, embankments, and lead arsenate herbicides (the later a huge problem when reusing them). And you could could farther: * Old playgrounds leave sand when covered by new buildings. * Old forests leave roots in the ground that could be detected by specialized equipment, even when paved over into parking lots. In all cases the argument that "some barely-detectable trace archaeological remnant remains" seems to be thin justification for a pre-held like of the feature. I think a better debate is "is the context needed for other mapping" and "is the data better kept maintained and displayed" if kept elsewhere?
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