[link to original on tumblr]
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Last month, I got a CD of Die Goldene Sieben - a German big band group from the mid- to late-30s. One of their songs ("Weil der D-Zug-Führer heute Hochzeit macht" ["Because the Express Train Conductor Is Getting Married Today"] credited to Schröder and Beckmann and from 1938) also has - at the very end - this plinking sound to resemble hammering on railroad spikes. I'm not sure if it's a dobro, but the same effect is achieved.
I remembered this when I listened to disc one of the SMiLE Sessions a few days ago, so I thought I would mention it here. I don't think it's likely that Brian Wilson knew about Die Goldene Sieben or even "Weil der D-Zug-Führer heute Hochzeit macht" specifically, but I thought it was interesting that there is historical precedence for that dobro effect.